This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
The most common cause of Pulmonary thromboembolism is 
Select and explain. 
A. DIC, B. Coagulation Disorder, C. DVT, D. Venous Hypeension
C: DVT
Answer: C: DVT 
Explanation: A late effect of DVT is a postphlebitic syndrome, which eventually occurs in more than one-half of DVT patients. Postphlebitic syndrome (also known as a post-thrombotic syndrome or chronic venous insufficiency) is a delayed complication of DVT that causes the venous valves of the leg to become incompetent and exude interstitial fluid. Patients complain of a chronic ankle or calf swelling and leg aching, especially after prolonged standing.Ref: Harrison's 18/e p2170, 17/e p1651