You are answering a USMLE-style medical question. Question: A 62-year-old man presents to the physician because of incomplete healing of a chest wound. He recently had a triple coronary artery bypass graft 3 weeks ago. His past medical history is significant for type 2 diabetes mellitus and hypertension for the past 25 years. Clinical examination shows the presence of wound dehiscence in the lower 3rd of the sternal region. The wound surface shows the presence of dead necrotic tissue with pus. Computed tomography (CT) of the thorax shows a small fluid collection with fat stranding in the perisurgical soft tissues. What is the most appropriate next step in the management of the patient? Options: A) Surgical debridement B) Negative pressure wound management C) Sternal wiring D) Sternal fixation Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.