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
All predispose to thrombosis except - 
Select and explain. 
A. Homocystinuria, B. PNH, C. Polycythemia, D. Hypomagnesemia
D: Hypomagnesemia
Answer: D: Hypomagnesemia 
Explanation: Ans. is 'd' i.e., Hypomagnesemia