<prompt> Point prevalence of a chronic disease is studied best by:Case control studyCross sectional studyHistorical cohortCohort  <response>: Ans: B Cross sectional study Ref: Textbook of Preventive and Social Medicine, K. Park, 22nd edition page no 59Explanation: Prevalence is an important measure of burden of disease in the community at a point of time or during a period of time. Accordingly they are called point prevalence and period prevalence. 