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: Forensic Medicine
Commonest cause of pulmonary embolism is: CMC (Vellore) 09 
Select and explain. 
A. Fat, B. Amniotic fluid, C. Thrombus, D. Air
C: Thrombus
Answer: C: Thrombus 
Explanation: Ans. Thrombus