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: Pathology
Most common site for small intestinal carcinoma is - 
Select and explain. 
A. Duodenum, B. Jejunum, C. lleum, D. All are affected equally
A: Duodenum
Answer: A: Duodenum 
Explanation: Answer- A. DuodenumAdenocarcinoma is the most frequent carcinoma found in small intestine.Upper small intestine is the most common site for carcinoma with duodenum, jejunum and ileum.