This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infections of the genital tract, Subject name: Gynaecology & Obstetrics
Drug of choice for Chlamydia in pregnancy : 
Select and explain. 
A. Doxycycline, B. Tetracycline, C. Erythromycin, D. Penicillin
C: Erythromycin
Answer: C: Erythromycin 
Explanation: Treatment of chlamydial infection Tetracycline 500mg and clindamycin 500mg 6 hourly for 14 days cefoxitin and ceftriaxone with doxycycline Amoxicillin 500mg qid 7 days erythromycin 500mg tid 15 days azithromycin 1mg orally single dose During pregnancy erythromycin or amoxicillin tid or qid for 7 days is given Reference: SHAW'S TEXTBOOK OF GYNAECOLOGY,Pg no:145,15th edition