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: Medicine
All of the following are risk factors for Hepatocellular carcinoma except: 
Select and explain. 
A. Hepatitis C infection, B. Alcoholism, C. Alfatoxins, D. Animal fat in diet
D: Animal fat in diet
Answer: D: Animal fat in diet 
Explanation: Answer is D (Animal fat in diet) Animal fat in diet is a known risk factor for development of colorectal cancer. It has not been mentioned as a risk for hepatocelhdar carcinoma. Risk factors for hepatocellular carcinoma: Major etiological factors Viral infection Hepatitis C infection Hepatitis B infection Chronic alcoholism Other etiological factors Alpha antitrypsin deficiency Hemochromatosis Tyrosinemia Primary biliary cirrhosis Food contaminants: Al fatoxins Exposure to thoriumdioxide or vinyl chloride Long term androgenic steroid administration Exposure to estrogen