This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Electrolyte Imbalance, Subject name: Medicine
[{'content': 'Chvostek sign is? \nSelect and explain. \nA. Twitching of circumoral muscles on tapping of facial nerve, B. Involuntary blink on tapping on facial nerve, C. Inability to open eye on tapping of facial nerve, D. Inability to close eye on tapping of facial nerve', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 1. Chvostek sign - seen in hypocalcemia - Twitching of Circumoral Muscle on tapping of Facial Nerve 2. Inability to open eye on tapping of facial nerve - L.P.S 3rd nerve', 'role': 'assistant'}]