This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'Treatment of choice for sputum positive pulmonary tuberculosis detected in 1st trimester of pregnancy- \nSelect and explain. \nA. Defer till second trimester, B. Sta cat. I immediately, C. Sta cat. II immediately, D. Sta cat. III immediately', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Park&;s Textbook of Preventive and Social Medicine 23rd edition Page no: 196 Tuberculosis in pregnancy is usually treated with isoniazid, rifampicin and ethambutol for 2 months, followed by isoniazid and rifampicin for an additional 7 months. Ethambutol can be stopped after the first month if isoniazid and rifampicin susceptibility is confirmed.', 'role': 'assistant'}]