This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuromuscular disorders, Subject name: Orthopaedics
[{'content': 'H reflex on electromyography is seen in: \nSelect and explain. \nA. L1 Radiculopathy, B. L4 Radiculopathy, C. L5 Radiculopathy, D. S1 Radiculopathy', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The H reflex is basically an electrophysiologically recorded Achilles tendon stretch reflex Is performed by stimulating the tibial nerve in popliteal fossa. It is recorded over the soleus or gastrocnemius muscles. It is used most commonly to evaluate S1 radiculopathy or to distinguish it from an L5 radiculopathy.i', 'role': 'assistant'}]