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
The drug of choice for the treatment of chlamydial infection is - 
Select and explain. 
A. Ampicillin, B. Third generation cephalosporins, C. Metronidazole, D. Doxycycline
D: Doxycycline
Answer: D: Doxycycline 
Explanation: None