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: Surgery
[{'content': 'All of the following are cause of blood in stools in children except - \nSelect and explain. \nA. Meckels diveiculum, B. Carcinoma, C. Intussusception, D. Juvenile polyp', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Carcinoma", 'role': 'assistant'}]