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
A 29-years-old male taking oral hypoglycemic drug never had ketonuria in his life. His BMI is 20.5. His grandfather had diabetes and his father who is the only son of his grandfather too had the disease. Which type of DM this person will be most likely - 
Select and explain. 
A. Pancreatic, B. MODY, C. Type I, D. Type II
B: MODY
Answer: B: MODY 
Explanation: None