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: Unknown
Hypersensitivity vasculitisis seen most commonly in 
Select and explain. 
A. Post capillary venules, B. Arterioles, C. Veins, D. Capillaries
A: Post capillary venules
Answer: A: Post capillary venules 
Explanation: HYPERSENSITIVITY VASCULITIS
In hypersensitivity vasuculitis, postcapillaryvenules are the most commonly involved vessels, capillaries and arterioles are involved less frequently.
It is primarily a disease of small vessels.
It is characterized by leukocytoclasis, a term that refers to the nuclear debris remaining from the neutrophils that have infiltrated in and around the vessels during the acute stages.