This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disease Causation, Measurements, Milestones, Subject name: Social & Preventive Medicine
[{'content': 'All about incidence are false, except :- \nSelect and explain. \nA. Not affected by duration, B. More than prevalence, C. Measures old and new cases, D. Used for chronic conditions', 'role': 'user'}, {'content': 'Answer: A \nExplanation: INCIDENCE Incidence is independent of duration of the disease . Incidence may be more or less or equal to prevalence. Incidence measures only the new cases. Incidence can be measured by coho study. It is more suitable for measurement in acute conditions. Measures efficacy of preventive and therapeutic measures. Good indicator of efficacy of health programs. Incidence = x 1000 Prevalence = total number of cases / total population x 100', 'role': 'assistant'}]