Which is the most common cause of intoeing in children 2 years of age and older?

Correct Answer: C

Rationale: Internal femoral torsion is the most common cause of intoeing in children over 2, often resolving spontaneously.

Correct Answer: D

Rationale: All listed statements are true; thus, D (implying one is false) is the correct answer as none are untrue.

Correct Answer: D

Rationale: Microcephaly is not a typical feature of osteogenesis imperfecta, unlike fragile bones, blue sclerae, and deafness.

Correct Answer: C

Rationale: Thyroid hormone doesn't directly stimulate 1,25(OH)₂D₃ production, unlike PTH and low calcium/phosphate levels.

Correct Answer: C

Rationale: Pseudohyponatremia occurs due to high plasma lipids or proteins (e.g., myeloma, hypertriglyceridemia) displacing water. Protein-losing enteropathy reduces proteins, not causing pseudohyponatremia.