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
MEN I syndrome is most commonly associated with: 
Select and explain. 
A. Gastrinoma, B. Insulinoma, C. Glucucagonoma, D. Somatistatinoma
A: Gastrinoma
Answer: A: Gastrinoma 
Explanation: Answer is A (Gastrinoma): Amongst the options provided Gastrinomas are the most common association with MEN-I