Correct Answer: B

Rationale: Correct Answer: B Rationale: 1. Rubbing alcohol or 2% acetic acid eardrops help to maintain the pH balance in the ear canal, making it less conducive to bacterial growth. 2. These eardrops also help to dry out excess moisture, reducing the risk of otitis externa. 3. By using these eardrops after every swim, the student can prevent the recurrence of otitis externa. Summary of other choices: A: Using a cotton-tipped swab can push wax deeper into the ear canal, increasing the risk of infection. C: Irrigating the ears can introduce water into the ear canal, potentially worsening the condition. D: Mineral oil and hydrogen peroxide can be harsh on the delicate skin of the ear canal, causing irritation.

Correct Answer: A

Rationale: Visual accommodation refers to the ability of the eye to adjust focus when shifting gaze between objects at different distances. The correct answer is A, pupillary constriction when looking at a near object, as this is a key component of visual accommodation. When looking at a near object, the eye needs to adjust its focus by constricting the pupil to allow more depth of field and clearer vision. This process helps in bringing near objects into focus. Choices B, C, and D are incorrect: B: Pupillary dilation when looking at a far object is not related to visual accommodation, as the pupil dilates in low light conditions to allow more light to enter the eye. C: Changes in peripheral vision in response to light is not related to visual accommodation, as peripheral vision refers to the ability to see objects outside the direct line of sight. D: Involuntary blinking in the presence of bright light is a protective reflex to shield the eyes from excessive light and is not directly related to visual

Correct Answer: D

Rationale: The correct answer is D because a loss of air conduction, known as conductive hearing loss, refers to a problem conducting sound waves through the outer or middle ear. This type of hearing loss can be caused by issues such as earwax buildup, fluid in the middle ear, or problems with the ear canal or eardrum. Choices A, B, and C are incorrect because air conduction is not the most efficient pathway for hearing (choice A), it is not caused by vibrations of bones in the skull (choice B), and the pitch of sound is determined by the frequency, not the amplitude (choice C). Conductive hearing loss specifically relates to the transmission of sound through the outer and middle ear structures, making choice D the correct statement.

Correct Answer: A

Rationale: The dry mucosa and deep fissures in the tongue indicate dehydration in the patient. Dehydration causes decreased saliva production, leading to dry mouth and tongue fissures. This is a common symptom of dehydration. The lack of moisture in the oral cavity can result in these physical signs. The other choices are incorrect because irritation by gastric juices typically presents with other symptoms, a normal oral condition would not show these specific findings, and side effects of nausea medication would not directly cause dry mucosa and deep fissures in the tongue. Therefore, the correct answer is A: dehydration.

Correct Answer: B

Rationale: The correct answer is B. When using an otoscope to assess the nasal cavity, it is crucial to avoid touching the nasal septum with the speculum to prevent discomfort or injury to the patient. Touching the nasal septum can cause pain and potential damage. Incorrect Choices: A: Inserting the speculum at least 3 cm into the vestibule is not necessary and may cause discomfort or injury to the patient. C: Displacing the nose to the side being examined is not required and may not provide any additional benefit during the assessment. D: Keeping the speculum tip medial to avoid touching the floor of the nares is not as critical as avoiding contact with the nasal septum, which is more sensitive and can be easily injured.