This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oncology, Subject name: Medicine
[{'content': 'Risk factor for Ca colon is/are - \nSelect and explain. \nA. Male sex, B. Red meat, C. Animal fat, D. NSAIDS', 'role': 'user'}, {'content': 'Answer: B \nExplanation: ref Harrison20th edition pg 675', 'role': 'assistant'}]