This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cell Wall Synthesis Inhibitors, Subject name: Pharmacology
Treatment of choice for late cardiovascular syphilis is? 
Select and explain. 
A. Benzathine penicillin 7.2 million units in three divided doses, B. Benzathine penicillin 2.4 million units single dose, C. Benzylpenicillin 12-24 million units for 21 days, D. Tetracycline 2g daily
A: Benzathine penicillin 7.2 million units in three divided doses
Answer: A: Benzathine penicillin 7.2 million units in three divided doses 
Explanation: Treatment of choice for late cardiovascular syphilis : Benzathine penicillin 7.2 million units in three divided doses, once a week. Benzathine penicillin G, 2.4 million units intramuscularly once a week for 1-3 weeks, is effective in the treatment of syphilis.