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
Which of the following is used in the prophylactic treatment of rheumatic heart disease : 
Select and explain. 
A. Ampicillin, B. Penicillin G, C. Benzathine penicillin, D. Phenoxymethylpenicillin
C: Benzathine penicillin
Answer: C: Benzathine penicillin 
Explanation: None