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 patient meets with an accident with resultant transaction of the pituitary stalk; what will NOT occur: 
Select and explain. 
A. Diabetes mellitus, B. Diabetes insipidus, C. Hyperprolactinemia, D. Hypothyroidism
A: Diabetes mellitus
Answer: A: Diabetes mellitus 
Explanation: Answer is A (Diabetes Mellitus): Insulin is a pancreatic hormone, not under the control of pituitary. Transection of the pituitary stalk would therefore in no way affect glucose levels or lead to diabetes mellitus.