Infants are born with maximum genu varum. The lower extremity straightens out around the age of

Correct Answer: C

Rationale: Physiologic genu varum (bowlegs) typically resolves by 24 months as the legs straighten with growth.

Correct Answer: D

Rationale: Spondylolisthesis most frequently occurs at L5-S1, where forward slippage is common.

Correct Answer: D

Rationale: Spasticity is a hallmark of upper motor neuron defects (e.g., stroke), due to increased muscle tone. Polyneuropathy, myopathy, and neuromuscular junction defects don't cause spasticity.

Correct Answer: D

Rationale: All statements are true: CK reflects muscle damage, MM is in skeletal muscle, MB in cardiac muscle, and BB in brain (not smooth muscle), but the question asks for the false statement, and all are correct as phrased, making this tricky. Assuming intent, D is least accurate in context.

Correct Answer: C

Rationale: Weakness of respiratory muscles is common in myasthenia gravis, especially in crisis, unlike the other options.