This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Surgery
Hoffman Tinel sign is seen in? 
Select and explain. 
A. Deep Vein Thrombosis, B. Nerve regeneration, C. Pulmonary embolism, D. Upper motor neuron lesion
B: Nerve regeneration
Answer: B: Nerve regeneration 
Explanation: Ans. (b) Nerve regenerationRef.: Bailey & Love 26th ed. 1471* Hoffman Tinel sign is seen in nerve regeneration and should not be confused with Homan sign seen in deep vein thrombosis.* Hoffman reflex is elicited by a reflex test which verifies the presence or absence of lesions in the cortico-spinal tract. It is also known as the finger flexor reflex. The test involves tapping the nail or flicking the terminal phalanx of the middle or ring finger. A positive response is seen with flexion of the terminal phalanx of the thumb.