<prompt> Tetracycline is used for the prophylaxis of:CholeraBrucellosisLeptospirosisMeningitis  <response>: Ans. A CholeraRef: Katzung, 11e p897, CMDT 2010, 1341, KDT 8e p788Tetracyclines are used for prophylaxis of both cholera Katzung as well as leptospirosis CMDT. However, if we have to choose one, we will go with cholera, as the table on pg 897 of Katzung clearly writes tetracycline for cholera prophylaxis whereas in CMDT reference, doxycycline is used for prophylaxis of leptospirosis. 