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
MEN II and MEN III are associated with: 
Select and explain. 
A. C-myc, B. Erb-B2, C. L-myc, D. Ret
D: Ret
Answer: D: Ret 
Explanation: Ret