A patient is very ill with pneumonia, despite large doses of sulfadiazine. Suddenly he develops weakness of the left arm and leg and becomes semi-stuporous. The stupor gradually clears and the weakness of the left side improves a little, but after three weeks a papilledema of four diopters appears. The patient is probably suffering from:

Correct Answer: B

Rationale: Brain abscess fits this progression: focal neurologic signs, stupor, and late papilledema from mass effect post-pneumonia.

Correct Answer: A

Rationale: Pellagra (niacin deficiency) leads to psychosis, dermatitis, and diarrhea.

Correct Answer: D

Rationale: Diabetes mellitus impairs Achilles reflexes from peripheral neuropathy.

Correct Answer: C

Rationale: Pulmonary abscesses most commonly result from aspiration of oral anaerobes.

Correct Answer: D

Rationale: Bronchial adenoma (carcinoid) commonly causes hemoptysis due to its vascularity.