Ipsilateral cervical cord compression at C6/C7 level causes:

Correct Answer: A

Rationale: C6/C7 compression affects the triceps reflex (C7, A, correct) ipsilaterally. Hyperalgesia below (B) suggests spinothalamic damage, but ipsilateral pain loss is more likely. Vibration sense (C) is contralateral via dorsal columns, but incomplete here. Knee jerk (L3-L4, D) is unaffected. A is most specific.

Correct Answer: B

Rationale: Cerebellar dysfunction causes past pointing (B, ataxia), hypotonia (not A), wide-based gait (not shuffling, C), and intention tremor (not resting, D). B is correct.

Correct Answer: A

Rationale: Taste travels via cranial nerves (VII, IX, X) to the medulla, then thalamus (A, correct), and cortex. Internal capsule (B) is a pathway, trochlear (C) is eye movement, and hypoglossal (D) is tongue movement. A is correct.

Correct Answer: B

Rationale: The pons (B) is the major input to the cerebellum via the middle cerebellar peduncle, relaying cortical signals for coordination. The midbrain (A) and medulla (C) have lesser roles, and spinal cord (D) input is via inferior peduncles. B is correct.

Correct Answer: D

Rationale: A stroke is caused by disruption of blood to the brain (D), either ischemic (clot) or hemorrhagic (bleed). Meningitis (A) is inflammation, lumbar puncture (B) is diagnostic, and CSF infection (C) is meningitis-related. D is correct.