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
Most common cause of gangrene of foot of 30-years old farmer who is a chronic smoker 
Select and explain. 
A. Raynaud’s disease, B. Myocardial infarction, C. Atherosclerosis, D. Thromboangitis obliterans
D: Thromboangitis obliterans
Answer: D: Thromboangitis obliterans 
Explanation: None