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
Clergyman's knee involves ? 
Select and explain. 
A. Olecranon bursa, B. Suprapatellar bursa, C. Infrapatellar bursa, D. Prepatellar bursa
C: Infrapatellar bursa
Answer: C: Infrapatellar bursa 
Explanation: Ans. is 'c' i.e., lnfrapatellar bursa