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: Pharmacology
Tetracycline is used for the prophylaxis of ? 
Select and explain. 
A. Cholera, B. Brucellosis, C. Leptospirosis, D. Meningitis
A: Cholera
Answer: A: Cholera 
Explanation: None