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
In pseudocholinesterase deficiency, drug to be used cautiously is 
Select and explain. 
A. Barbiturate, B. Succinylcholine, C. Halothane, D. Gallamine
B: Succinylcholine
Answer: B: Succinylcholine 
Explanation: 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.