This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Racemic mixture of two enantiomers with different pharmaeokinetic and pharmacodynamic propeies is seen in - \nSelect and explain. \nA. Dilantin, B. Digoxin, C. Verapamil, D. Octreotide', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is \'c\' i.e., Verapamil " Verapamil is prescribed as a racemate, L-Verapamil is a more potent calcium channel blocker than is dverapamil. However with oral therapy, the 1-enantiomer undergoes more extensive first - pass hepatic metabolism. For this reason, a given concentration of verapamil prolongs the PR interval to a greater extent when the drug is administered intravenously (where concentrations of the 1-and d-enantiomers are equivalent) than when it is administered orally."', 'role': 'assistant'}]