You are answering a USMLE-style medical question. Question: A 55-year-old man is brought to the emergency department after collapsing at the grocery store and losing consciousness for 1 minute following a sudden onset of palpitations. He has no chest pain or dizziness. He has a history of hypertension, type 2 diabetes mellitus, and is currently being treated as an outpatient for pneumonia. His current medications include lisinopril, metformin, and azithromycin. He has no sign of injury, and he appears well. During the examination, he loses consciousness again. Telemetry shows polymorphic ventricular tachycardia with cyclic alteration of the QRS axis, which spontaneously resolves after 30 seconds. Which of the following is the most likely underlying cause of this patient's syncope? Options: A) Hypomagnesemia B) Brugada syndrome C) Prolonged QT interval D) Hyperkalemia Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.