This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Medical Illness Complicating Pregnancy, Subject name: Gynaecology & Obstetrics
Chlamydia in pregnancy, what is the best treatment? 
Select and explain. 
A. Doxycycline, B. Tetracycline, C. Azithromycin, D. Penicillin
C: Azithromycin
Answer: C: Azithromycin 
Explanation: Azithromycin is first-line treatment and has been found to be safe and effective in pregnancy. The fluoroquinolones, erythromycin estolate and doxycycline are avoided in Pregnancy.