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: Surgery
Buerger's disease affects all except - 
Select and explain. 
A. Small aeries, B. Small veins, C. Medium size aeries, D. Multiparity
D: Multiparity
Answer: D: Multiparity 
Explanation: Answer 'd' Multiparity