The most common cause of neonatal cholestasis is

Correct Answer: D

Rationale: Biliary atresia is the most common cause of neonatal cholestasis. It results from progressive fibrosis and obliteration of the extrahepatic bile ducts, leading to conjugated hyperbilirubinemia.

Correct Answer: D

Rationale: Chlamydia trachomatis is a frequent cause of afebrile pneumonia in infants, typically acquired during birth.

Correct Answer: A

Rationale: Obstructive shock results from physical blockage of blood flow, such as cardiac tamponade or pulmonary embolism, impairing ventricular output.

Correct Answer: A

Rationale: Skin thickening due to fibrosis is a hallmark feature of scleroderma.

Correct Answer: B

Rationale: A PDA murmur is continuous and may resemble a venous hum in timing and duration, though PDA murmur is best heard at the left infraclavicular area and is louder in systole.