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': 'A new drug does not prevents a disease from occurring but reduce death due to that disease. Which of the following is true: March 2005, March 2013 (b) \nSelect and explain. \nA. It will increase the incidence and prevalence, B. It will decrease the incidence and prevalence, C. Prevalence is increased, D. Incidence is increased', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C: Prevalence is increased In epidemiology, the prevalence of a disease in a statistical population is defined as the total number of cases of the disease in the population at a given time, or the total number of cases in the population, divided by the number of individuals in the population. It is used as an estimate of how common a condition is within a population over a ceain period of time. Prevalence refers to all current cases (old and new) existing at a given point in time, or over a period of time in a given population. Although referred to as a rate, prevalence rate is a ratio. Incidence rate is the number of new cases occurring in a defined population during a specified period of time.', 'role': 'assistant'}]