This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other topics and Adverse effects, Subject name: Anatomy
[{'content': 'Which of the following drug is least effective luminal amoebicide \nSelect and explain. \nA. Metronidazole, B. Diloxanide furoate, C. Iodoquinol, D. Paromomcin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref-KDT 6/e p798,799 Metronidazole is least effective luminal amoebicide because it is almost completely observed in small intestine and little drug is available to act in the colon', 'role': 'assistant'}]