This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Surgery
The commonest site of lymphoma in the gastrointestinal system is 
Select and explain. 
A. Small bowel, B. Stomach, C. Large intestine, D. Oesophagus
B: Stomach
Answer: B: Stomach 
Explanation: Stomach is the commonest site of lymphoma in the gastrointestinal system is Stomach(55%). Helicobacter pylori infection is the causative agent commonly. Other sites are small bowel(30%), colon(10%), ileocaecal region (5%).Reference : page 856 SRB's manual of surgery 5th edition