This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'Ideal graft for leg injury with 10 x 10 cm. exposed bone \nSelect and explain. \nA. Amniotic member graft, B. Pedicle graft, C. Full thickness graft, D. Split thickness skin graft', 'role': 'user'}, {'content': 'Answer: B \nExplanation: For a skin graft (Full thickness or split thickness or amniotic membrane) to survive, it must be revascularized by recipient bed. Radiation damaged tissues and relatively avascular structures such as bone, tendon, cartilages\xa0are therefore poor recipient sites.\nSo an exposed bone surface is covered by a graft which has its own blood supply. Such grafts are k/a flaps or pedicle grafts.\nSabiston writes - "Pedicle graft or flap is a partially or completely isolated segment of tissue with its own blood supply."\n\n"Absolute indications for flaps -\nexposed bone, radiated vessels, brain, an open joint or nonbiological implants materials. Pressure sores where a bony prominence is exposed."', 'role': 'assistant'}]