You are answering a USMLE-style medical question. Question: A 44-year-old woman comes to the physician because of a 6-month history of fatigue, intermittent fever, a 4.0-kg (8.8-lb) weight loss, and a progressive, non-productive cough. She does not smoke. Physical examination shows mild wheezing over bilateral lung fields and enlarged supraclavicular and cervical lymph nodes. A CT scan of the chest is shown. A biopsy specimen of a cervical lymph node shows organized epithelioid histiocytes and multinucleated giant cells without focal necrosis. The initial treatment of this patient's condition should include which of the following drugs? Options: A) Cisplatin B) Lamivudine C) Isoniazid D) Prednisone Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.