This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
A person sustains head trauma leading to transection of pituitary stalk. All can be consequence of this, except - 
Select and explain. 
A. SIADH, B. Diabetes mellitus, C. Diabetes incipidus, D. Hyperprolactinemia
B: Diabetes mellitus
Answer: B: Diabetes mellitus 
Explanation: diabetes mellitus is a multi system disorder due to genetic and environmental factors ( Harrison 17 pg 2275)