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
Which of the following is not related with carcinoma stomach - 
Select and explain. 
A. Blood Group O, B. Blood group A, C. Smoked fish, D. Nitrosoamines
A: Blood Group O
Answer: A: Blood Group O 
Explanation: None