Correct Answer: D

Rationale: The correct answer is D, an ulceration with rolled edges on the side of the tongue, as it could indicate a possible malignancy such as oral cancer. The presence of rolled edges is concerning for malignancy due to the irregularity in shape and potential for rapid growth. This finding should be promptly investigated to rule out cancer. A: A painful vesicle inside the cheek for 2 days is likely a benign condition such as a canker sore. B: The presence of moist, nontender Stenson's ducts is a normal finding in the mouth. C: Stippled gingival margins that adhere snugly to the teeth could indicate a healthy gum tissue attachment. In summary, the other choices are less concerning as they are either benign or normal variations, while the presence of an ulceration with rolled edges raises significant suspicion for malignancy.

Correct Answer: D

Rationale: The Romberg test assesses the maintenance of standing balance by having the patient stand with feet together, arms at the sides, and eyes closed. If the patient sways or loses balance, it may indicate proprioceptive deficits. Conductive hearing loss (A) is related to sound transmission issues in the outer or middle ear, not balance. Lateralization of hearing (B) relates to distinguishing sound direction. Sensorineural loss (C) involves inner ear or auditory nerve damage, not balance. Therefore, the correct answer is D as the Romberg test specifically evaluates standing balance.

Correct Answer: C

Rationale: The correct answer is C: Degeneration of nerves in the inner ear. This is likely the cause of the patient's hearing difficulties, as age-related degeneration of nerves in the inner ear can lead to difficulty distinguishing sounds and determining their direction. Atrophy of the apocrine glands (Choice A) and cilia becoming coarse and stiff (Choice B) are not related to hearing loss. Scarring of the tympanic membrane (Choice D) would affect sound conduction but not the perception of sound direction and clarity.

Correct Answer: D

Rationale: The correct answer is D. At 18 months, it is expected for a child to have erupted around 16 deciduous teeth. The rationale for this answer is based on dental development milestones. By age 3, most children should have their full set of 20 primary teeth. Therefore, the nurse should inform the mother that it is normal for an 18-month-old to have around 16 teeth. Choice A is incorrect as comparing the mother's teeth at that age is irrelevant to the child's dental development. Choice B is incorrect because all 20 deciduous teeth should be present by age 3, not 4. Choice C is incorrect as having 12 teeth at 18 months is below the expected number of erupted teeth for that age.

Correct Answer: A

Rationale: The correct answer is A because vision is not fully developed until around 2 years of age. Newborns have limited visual capabilities and their visual acuity improves over time. Choices B, C, and D are incorrect because infants do not develop the ability to focus on an object at 8 months (B), develop coordinated eye movements by 3 months (C), or have uncoordinated eye movements in the first year of life (D). These statements do not accurately reflect the timeline of visual development in infants.