<prompt> Point shource epidemic is -Short term fluctuationPeriodic fluctuationLong term fluctuationSecular trend  <response>: Ans. is a i.e., Short term fluctuation Point source single exposure epidemic is short term fluctuation. There are three kinds of time trends or fluctuations in disease occurenceA. Short term fluctuations - epidemics.B. Secular trends or long term fluctuations.C. Periodic fluctuation. 