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': 'Oral vancomycin can be used for treatment of ? \nSelect and explain. \nA. Hepatic encephalopathy, B. Pseudomembranous colitis, C. Staphylococcal food poisoning, D. None of the above', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Pseudomembranous colitis o Vancomycin is used orally to treat pseudomembranous colitis by clostridium difficile because it is not absorbed from the gastrointestinal tract and higher concentration reaches the colon.", 'role': 'assistant'}]