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
The commonest site of thrombosis is ? 
Select and explain. 
A. Vein, B. Aery, C. Hea, D. Capillary
A: Vein
Answer: A: Vein 
Explanation: Ans. is 'a' i.e., Vein o Aerial thrombosis is much less common than venous thrombosis.