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
30 Yr old man which is most likely organism causing infection of epididymis - 
Select and explain. 
A. E.coli, B. Gonococci, C. Chlamydia, D. Ureaplasma ureolyticum
C: Chlamydia
Answer: C: Chlamydia 
Explanation: None