This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Peripheral Nerve Injuries, Subject name: Orthopaedics
[{'content': "Tinel's sign is - \nSelect and explain. \nA. Sensation on tapping the nerve, B. Numbness in the region of the nerve on inflating the pneumatic cuff, C. Tingling on flexion of the joint, D. Applying direct pressure", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Sensation on tapping the nerve Tinels sign:* Brisk percussion along the course of an injured nerve from distal to proximal direction may elicit a tingling sensation in the distal distribution of the nerve.* This is described as Tinels sign.* The point of hypersensitivity marks the site of abnormal nerve sprouting: if it progresses distally at successive visits this signifies regeneration; if it remains unchanged this suggests a local neuroma.", 'role': 'assistant'}]