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
Felon is an infection of: 
Select and explain. 
A. Scalp, B. Face, C. Finger, D. Scrotum
C: Finger
Answer: C: Finger 
Explanation: A felon is a closed-space, purulent infection of the fingeip pulp. Ref: Schwaz's principle of surgery 9th edition, chapter 44.