You are answering a USMLE-style medical question. Question: A 23-year-old man is admitted to the hospital with fever, chest discomfort, tachypnea, pain, needle-like sensations in the upper extremities, and profuse sweating. He also complains of a gradual decrease in vision over the past 3 months. He is a bodybuilding competitor and has a competition coming up in 1 week. The man reports that his symptoms appeared suddenly, 30 minutes after he took 2 foreign-manufactured fat-burning pills instead of the 1 he usually takes. His blood pressure is 140/90 mm Hg, heart rate is 137/min, respiratory rate is 26/min, and temperature is 39.9°C (103.8°F). Physical examination reveals a reddish maculopapular rash over the patient’s trunk, diminished lung and heart sounds, tenderness to palpation in his abdomen, and rotational bilateral nystagmus with an alternating gaze-dependent fast component. Ophthalmologic examination shows bilateral cataracts. The patient’s total blood count is as follows: Erythrocytes 4.4 x 109/mm3 Hb 12 g/dL Total leukocyte count 3750/mm3 Neutrophils 57% Lymphocyte 37% Eosinophil 1% Monocyte 5% Basophil 0% Platelet count 209,000/mm3 Which of the following statements best describes the pathogenesis of this patient’s condition? Options: A) The patient’s symptoms are caused by an increased concentration of epinephrine released by the adrenal glands in response to the consumed substance. B) The drug caused uncoupling of the electron transport chain and oxidative phosphorylation. C) The patient has a pyretic reaction due to bacterial contamination of the pills. D) The drug has stimulated the hypothalamic temperature center to produce hyperthermia. Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.