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': 'In the treatment of intestinal and extraintestinal amoebiasis which of the following drug is useful: \nSelect and explain. \nA. Diloxane, B. Metronidazole, C. Chloroquine, D. Cefaclor', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]