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': 'Flap commonly used in breast reconstruction is- \nSelect and explain. \nA. Serratus anterior, B. TRAM, C. Flap from arm, D. Delto pectoral flap', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]