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
Which of the following materials for implants will evoke least inflammatory tissue response - 
Select and explain. 
A. Polypropylene, B. Bovine collagen, C. Polygiactin, D. Cotton
A: Polypropylene
Answer: A: Polypropylene 
Explanation: None