This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Microbial, 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. Benzyl penicillin 12-24 million units for 21 days, D. Tetracycline 2 g 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: Ans. (A) Benzathine penicillin 7.2 million units in three divided dosesSyphilisDrug of choiceRouteDoseFrequencyDurationPrimaryBenzathinePenicillin GIntramuscular2.4 MUSingle doseSingle doseSecondaryBenzathinePenicillin GIntramuscular2.4 MUSingle doseSingle doseEarly latentBenzathinePenicillin GIntramuscular2.4 MUSingle doseSingle doseLate latentBenzathinePenicillin GIntramuscular2.4 MUWeekly3 weeksTertiary exceptneurosyphilisBenzathinePenicillin GIntramuscular2.4 MUWeekly3 weeksNeurosyphilisPenicillin GIntramuscular5 MU6 hourly10-14 days