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
Which of the following is the drug of first choice for Non-Gonococcal Urethritis - 
Select and explain. 
A. Ceftriaxone, B. Ciprofloxacin, C. Doxycycline, D. Minocycline
C: Doxycycline
Answer: C: Doxycycline 
Explanation: None