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: Skin
Drug of choice for treating chylmydia with gonorrhea is ? 
Select and explain. 
A. Ciprofloxacin, B. Norfloxac in, C. Nalidixic acid, D. Doxycycline
D: Doxycycline
Answer: D: Doxycycline 
Explanation: Ans. is 'd' i.e., Doxycycline