This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pathophysiology - Neoplasms, Subject name: Surgery
Most common site for carcinoma pancreas is - 
Select and explain. 
A. Head, B. Body, C. Tail, D. Neck
A: Head
Answer: A: Head 
Explanation: Ans. is 'a' i.e., Head o Most common site for carcinoma pancreas is head. The distribution as follows -* Head (75%)# Body (15%)# Tail (10%)o Ductal adenocarcinoma is the most common variety (90%)Also knowo Risk factors for pancreatic Ca* Cigarette smoking is the most consistent risk factor* As in other gastrointestinal cancers, diets high in fat and low in fibre, fruits and vegetables are thought to be associated with an increased risk,o Other risk factors are* Chronic pancreatitis* Diabetes* Obesityo Alcohol abuse or cholelithiasis are not risk factors for pancreatic cancer.