This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intestinal Polyps, Colon & Anal Cancer, Subject name: Pathology
[{'content': 'Based on epidemiological studies, which of the following has been found to be most protective against colon cancer? \nSelect and explain. \nA. High fiber diet, B. Low fat diet, C. Low selenium diet, D. Low protein diet', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ENVIRONMENTAL FACTORS & ITS ASSOCIATED RISK TO CAUSE COLON CANCER: INCREASED RISK PROTECTIVE FACTORS High intake of dietary lipids Pelvic irradiation Streptococcus bovis endocarditis Ureterosigmoidostomy High fiber diet NSAIDs Hormone Replacement Therapy', 'role': 'assistant'}]