This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fracture Management, Subject name: Orthopaedics
Diagnostic sign of a fracture: 
Select and explain. 
A. Abnormal mobility at fracture site, B. Pain at the fracture site, C. Tenderness, D. Swelling
A: Abnormal mobility at fracture site
Answer: A: Abnormal mobility at fracture site 
Explanation: Tenderness is the commonest (consistent) sign of fracture. Abnormal mobility and loss of transmitted movements is surest sign of fracture Crepitus occurs because of rubbing of both fracture ends together and gives sense of friction between fractured ends, it should not be elicited as it may cause neurogenic shock or may cause comminution at fracture ends due to rubbing of bone ends.