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: 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: C

Rationale: The correct answer is C: the presence of shadows, which may indicate glaucoma. When a light is directed across the iris from the temporal side, it helps in evaluating the presence of shadows in the anterior chamber angle, which can suggest a narrow or closed angle glaucoma. This technique is known as transillumination test and is important in detecting potential glaucoma cases. A: Drainage from dacryocystitis is incorrect as it is typically assessed by pressing on the lacrimal sac area to observe for discharge. B: Conjunctivitis over the iris is incorrect as conjunctivitis is an inflammation of the conjunctiva, not the iris. D: A scattered light reflex indicative of cataracts is incorrect as cataracts cause clouding of the lens, not scattering of light across the iris.

Correct Answer: B

Rationale: The correct answer is B: know that these are scars caused from frequent ear infections. The presence of dense white patches on the tympanic membrane in a patient with a history of chronic ear infections indicates scarring from previous infections. This is a common finding in individuals who have experienced recurrent middle ear infections. The other choices are incorrect because: A) Fungal infections typically present with different characteristics such as discoloration or debris in the ear canal, not dense white patches on the tympanic membrane. C) Blood in the middle ear would manifest as redness or hemorrhage, not white patches. D) While scarring may affect hearing, the description of the tympanic membrane in this case does not suggest any immediate concern for hearing loss.

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.