This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Motor System, Subject name: Physiology
[{'content': 'Which of the following reflexes is monosynaptic? \nSelect and explain. \nA. Achilles, B. Babinski, C. Corneal, D. Extensor plantar', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The Achilles reflex, or ankle jerk reflex, is a myotatic monosynaptic (stretch) reflex that is mediated by cord segment S1. It is the simplest reflex arc in which there is a single synapse between the afferent and efferent neurons. Reflex arcs in which interneurons are interposed between the afferent and efferent neurons are called polysynaptic reflexes. Some impoant myotatic reflexes: Biceps (C5, C6 spinal nerve); Triceps (C7 spinal nerve); Patellar (L4 spinal nerve).', 'role': 'assistant'}]