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': 'Callus formation is seen between what duration of fracture healing ? \nSelect and explain. \nA. 0 - 2 weeks, B. 2 - 4 weeks, C. 4 - 12 weeks, D. 12 - 16 weeks', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., 4 - 12 weeks Healing of a fracture The process of fracture healing varies according to the type of bone involved and the amount of movement at the fracture site. Following healing processes are there :? Indirect fracture healing (healing by callus) This is the 'natural' form of healing in tubular bones and in the absence of rigid fixation when there is micromovement at fracture site. There is formation of internal and external callus. This stage is divided in three phases which are fuher subdivided into five stages :", 'role': 'assistant'}]