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
Drug of choice in pregnant women with Secondary Syphilis: 
Select and explain. 
A. Doxycycline, B. Benzathine Penicillin, C. Ceftriaxone, D. Cotrimoxazole
B: Benzathine Penicillin
Answer: B: Benzathine Penicillin 
Explanation: Benzathine Penicillin