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: Social & Preventive Medicine
[{'content': 'According to CDC recommendations, HIV screening of pregnant women is - \nSelect and explain. \nA. Opt in testing, B. Opt out testing, C. Compulsory, D. Symptomatic', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Opt out testing", 'role': 'assistant'}]