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: Pathology
[{'content': 'Commonest site of amoebiasis in the gut -a)  Ileumb)  Caecumc)  Ascending colond)  Transverse colone)  Sigmoid colon \nSelect and explain. \nA. bc, B. c, C. ac, D. ad', 'role': 'user'}, {'content': 'Answer: A \nExplanation: E. histolytica forms flask shaped ulcers.\nAmebiasis most frequently involves the cecum and ascending colon, followed in order by the sigmoid, rectum, and appendix.', 'role': 'assistant'}]