Two related recalls. (a) The drug of choice to treat Chlamydia infection in pregnancy, when azithromycin is an option, is: A. Tetracycline, B. Doxycycline, C. Erythromycin, D. Azithromycin (Ans D). (b) When azithromycin is not listed and the choice is between A. Tetracycline, B. Doxycycline, C. Erythromycin, D. Penicillin, the drug of choice is Erythromycin (Ans C). The single combined answer below addresses the version that lists azithromycin. Which is the drug of choice for Chlamydia in pregnancy?