This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
All of the following conditions may predispose to pulmonary embolism except 
Select and explain. 
A. Protein S deficiency, B. Malignancy, C. Obesity, D. Progesterone therapy
D: Progesterone therapy
Answer: D: Progesterone therapy 
Explanation: Oesterogen predisposes to thrombosis and not progesterone