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': 'Pathognomonic sign of traumatic fracture is \nSelect and explain. \nA. Redness, B. Swelling, C. Crepitus, D. Tenderness', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Crepitus Fracture is a break in structural continuity of bone. It may be no more than a crack, a crumpling or a splintering of the coex; most often the break is complete & the bone fragments are displaced.', 'role': 'assistant'}]