Lysinuric protein intolerance is characterized by all of the following EXCEPT

Correct Answer: A

Rationale: Mental retardation is not universal in lysinuric protein intolerance; other features are typical.

Correct Answer: D

Rationale: Achilles tendon xanthomas are classic in heterozygous FH.

Correct Answer: C

Rationale: GM1-gangliosidosis includes both features.

Correct Answer: B

Rationale: Von Gierke (type I) causes hypoglycemia and hepatomegaly.

Correct Answer: A

Rationale: Hypocalcemia in nephrotic syndrome is due to low albumin (B), reduced calcium absorption (C), and loss of vitamin D-binding protein (D). Prednisone (E) can contribute, but decreased renal α-hydroxylase (A) is not a primary cause; it’s more linked to renal failure.