The MOST common location of spondylolysis is

Correct Answer: D

Rationale: Spondylolysis most commonly occurs at L5 due to mechanical stress at the lumbosacral junction.

Correct Answer: B

Rationale: Myopathies (e.g., muscular dystrophy) typically present with proximal weakness. Polyneuropathy causes distal weakness; neuromuscular junction defects and upper motor neuron defects don't specifically target proximal muscles.

Correct Answer: C

Rationale: McArdle syndrome (glycogen storage disease V) leads to exercise-induced rhabdomyolysis due to impaired glycogen breakdown. Others don't typically cause this.

Correct Answer: C

Rationale: Duchenne muscular dystrophy presents with proximal weakness (difficulty climbing stairs), delayed motor milestones, and pseudohypertrophy of calves. Other conditions don't match this pattern.

Correct Answer: B

Rationale: Malignant hyperthermia is triggered by anesthetics (e.g., halothane), not radiographic dyes, making B false. It's autosomal dominant, causes myoglobinuria, and is treated with dantrolene.