This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breast, Subject name: Surgery
[{'content': "Halstaed's mastectomy is \nSelect and explain. \nA. Simple mastectomy, B. Wide local excision, C. Radical mastectomy, D. Modified radical Mastectomy", 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. (c) Radical Mastectomy(Ref Internet Sources)Halstaed Radical mastectomy is historical.* It involves removal of Entire breast, Nipple and areola with tumor* Also removes all level 1,2,3 nodes* Muscles like Pectoralis major, Serratus Anterior are also removed.* It's a very high morbid procedure and hence not done now a days after the wide usage of chemotherapy and radiotherapy.* Now we commonly do MRM- in which Pectoralis major muscle is preserved.", 'role': 'assistant'}]