This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Plastic Surgery and Skin Lesions, Subject name: Surgery
[{'content': 'A 3-6 cm scalp defect is closed by:- \nSelect and explain. \nA. Primary simple closure, B. Split skin grafting, C. Secondary closure, D. Local flaps', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Flap: Paially or complete isolated segment of the tissue with its own blood supply Absolute indications for flaps- -exposed bone -radiated vessel -exposed brain -open joint or non- biological implant materials -pressure sores at bony prominences', 'role': 'assistant'}]