You are answering a USMLE-style medical question. Question: A 58-year-old man is brought to the emergency department because of sudden-onset right-sided body numbness for 1 hour. He reports that he has a 15-year history of hypertension treated with hydrochlorothiazide. He is alert and oriented to time, place, and person. Neurological examination shows decreased sensation to light pinprick and temperature on the right side of the face and body. Motor strength is 5/5 and deep tendon reflexes are 2+ bilaterally. Perfusion of which of the following structures of the brain is most likely impaired in this patient? Options: A) Posterior limb of the internal capsule B) Lateral medulla C) Basal pons D) Ventral thalamus Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.