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: Medicine
[{'content': 'True statement regarding amoebic dysentry \nSelect and explain. \nA. Incubation period 7-10 days, B. Profuse, watery diarrhoea, C. Diagnostic mucosal lesion most common in rectum, D. Diagnostic mucosal findings on sigmoidoscopy', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]