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: Skin
Drug of choice for syphilis in a pregnant women 
Select and explain. 
A. Azithromycin, B. Penicillin, C. Tetracycline, D. Ceftriaxone
B: Penicillin
Answer: B: Penicillin 
Explanation: B i.e. Penicillin Penicillin is the only recommended agent for treatment of syphilis in pregnancyQ. If the patient has a documented penicillin allergy, desensitization and penicillin therapy should be given.