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
Risk factor for Ca colon is/are - 
Select and explain. 
A. Male sex, B. Red meat, C. Animal fat, D. NSAIDS
B: Red meat
Answer: B: Red meat 
Explanation: ref Harrison20th edition pg 675