This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Screening, Subject name: Social & Preventive Medicine
[{'content': 'True positivity is indicated by- \nSelect and explain. \nA. Sensitivity, B. Specificity, C. Predictive value, D. Validity', 'role': 'user'}, {'content': 'Answer: A \nExplanation: .the term sensitivity is defined as the ability of a test to identify correctly al those who have the disease,that is true positive. ref:park&;s textbook,22nd edition,pg no 131', 'role': 'assistant'}]