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: Medicine
Cause of nail bed infarctions  a) H.D  b)  Wegener's granulomatosis  c) Infective endocardities   d) Surge strauss syndrome  e) PAN 
Select and explain. 
A. abc, B. bc, C. bd, D. cd
B: bc
Answer: B: bc 
Explanation: None