This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Muscle relaxants, Subject name: Anaesthesia
[{'content': 'In pseudocholinesterase deficiency, drug to be used cautiously is \nSelect and explain. \nA. Barbiturate, B. Succinylcholine, C. Halothane, D. Gallamine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pseudocholinesterase deficiency is a rare condition that makes you sensitive to ceain muscle relaxants -succinylcholine or mivacurium -- used during anesthesia. The drugs are designed to briefly relax your muscles during a medical procedure.', 'role': 'assistant'}]