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': 'Route of administration of vancomycin in pseudomembranous colitis is: \nSelect and explain. \nA. i.m., B. oral, C. i.v., D. s.c', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]