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: C

Rationale: The correct answer is C: decreased ability to identify odors. As people age, their sense of smell tends to decline due to changes in the olfactory system. This is a common phenomenon in older adults and can impact their overall quality of life. The other choices are incorrect because hypertrophy of the gums (A) is not a typical finding in older adults, increased production of saliva (B) is not directly related to aging, and finer and less prominent nasal hair (D) is not a definitive characteristic of older age.

Correct Answer: C

Rationale: The correct answer is C: A thin, translucent membrane. In elderly patients, the tympanic membrane tends to become thinner and more translucent due to age-related changes. This is considered a normal finding as it is a common occurrence in older individuals. The other choices are incorrect because: A) Loss of high-tone frequency hearing is not a normal finding in an ear examination of an elderly patient, as age-related hearing loss typically affects high frequencies. B) Increased elasticity of the pinna is not a common age-related change and may indicate a different issue. D) A shiny pink tympanic membrane is not a typical finding in an elderly patient and could suggest inflammation or infection instead of a normal age-related change.

Correct Answer: D

Rationale: The correct answer is D: Second-hand cigarette smoke. Exposure to second-hand smoke can irritate and inflame the lining of the Eustachian tube, making young children more susceptible to ear infections. This is supported by research showing a clear link between exposure to cigarette smoke and increased rates of ear infections in children. Family history (A) may contribute to genetic predisposition but is not a direct risk factor. Air conditioning (B) does not directly cause ear infections. Excessive cerumen (C) can lead to blockages but is not a primary risk factor for infections.

Correct Answer: C

Rationale: Rationale: The patient's symptoms of facial pain, fever, malaise, swollen turbinates, purulent nasal discharge, pain in cheeks and teeth, and pain upon palpation all point towards maxillary sinusitis. The maxillary sinuses are located in the cheek area, and infection can lead to the described symptoms. Frontal sinusitis typically presents with forehead pain, and nasal polyps would not cause the specific symptoms mentioned. Posterior epistaxis involves bleeding from the back of the nose and is not consistent with the patient's symptoms. Therefore, the correct answer is C: maxillary sinusitis.