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': 'Which of the following is/are true about a screening test? \nSelect and explain. \nA. Sensitivity is 1 – False positive rate, B. None of the these, C. Specificity is 1 – False negative rate, D. Post-test probability is Pre-test probability multiplied by Prevalence', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]