This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Pharmacology, Subject name: Pharmacology
[{'content': 'Saturable kinetics is seen in: \nSelect and explain. \nA. Phenvtoin, B. Diazepam, C. Digoxin, D. Barbiturate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans: a (Phenytoin) Ref: KDT, 6 ed, p. 404Saturable kinetics is seen in phenytoin.Phenvtoin pharmacokinetics:Phenytoin is metabolised by hydroxylation & glucuronide conjugation.Kinetics is capacity limited: it changes from first order to zero order over therapeutic range.Drugs showing zero order kinetics:Mnemonic: "PET SHOP "p-E-T-S-H-O-P-PhenytoinEthanolTolbutamideSalicylate- aspirintHeophyllineOral anticoagulant- warfarinPropanolol', 'role': 'assistant'}]