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: Social & Preventive Medicine
Tetracycline is used in prophylaxis of which of the following diseases? 
Select and explain. 
A. Cholera, B. Brucellosis, C. Leptospirosis, D. Meningitis
A: Cholera
Answer: A: Cholera 
Explanation: Tetracycline is the drug of choice for chemoprophylaxis of cholera. Ref: Preventive and Social Medicine, by K.Park, 19th edition, Page 106, 193, 194, 141, 142; Harrison's Internal Medicine, 16th edition, Page 917, 991.