Correct Answer: C

Rationale: Low-set ears in a neonate suggest major abnormalities and should prompt further evaluation. The correct alignment of the top of the pinnae of the ear with the outer canthus of the eye is crucial. Nystagmus, an involuntary eye movement, is common in newborns and often resolves on its own. Epstein pearls, small cysts on the hard palate, are insignificant and disappear over time. A positive Babinski reflex is normal in infants up to 1 year of age. Therefore, the presence of low-set ears is the most concerning finding that requires immediate attention.

Correct Answer: D

Rationale: The correct answer is D: 'Before meals'. Chest physiotherapy should be performed before meals to reduce the risk of vomiting and to ensure that the airways are clear for effective nutrition. Choices A, B, and C are incorrect because chest physiotherapy is ideally done before meals to optimize its benefits and avoid complications associated with timing.

Correct Answer: A

Rationale: A fistula typically has fewer complications, allows for greater freedom of movement, and involves natural vessel changes that improve dialysis efficiency. However, it is not ready for immediate use, which is why it may take weeks to mature before it can be used.

Correct Answer: A

Rationale: In infants, urinary tract disorders may present with poor feeding, hypothermia, and frequent urination. Pallor can be associated with other conditions but is less specific to urinary tract disorders.

Correct Answer: C

Rationale: Vulvar irritation may indicate an infection or other issues and should be further evaluated. In a pubescent girl, breasts of slightly different sizes and irregular periods are common variations of normal development. Supernumerary nipple, an extra nipple, is a benign condition that is not typically concerning during puberty.