This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Medical Illness Complicating Pregnancy, Subject name: Gynaecology & Obstetrics
[{'content': 'In a pregnant lady of 8 weeks and 4 days, VDRL was done which confirmed the presence of treponema pallidum infection. The drug of choice for treatment is \nSelect and explain. \nA. Erythromycin, B. Penicillin, C. Azithro, D. Doxy cycline', 'role': 'user'}, {'content': 'Answer: B \nExplanation: DOC for syphilis is benzathine penicillin. The causative agent for syphilis is Treponema pallidum. Transplacental transmission is the most common route Newborn may have jaundice petechiae or purpuric skin lesions, lymphadenopathy, rhinitis, pneumonia, myocarditis, nephrosis, or long-bone involvement. Treatment: Benzathine penicillin G, 2.4 million units I.M. as a single injection--some recommend a second dose 1 week later', 'role': 'assistant'}]