<prompt> Which of the following is false with regard to prevalence ?It is a product of incidence and duration.It can be determined by a cross-sectional studies.It is a rate.Prevalence is point prevalence unless otherwise specified.  <response>: Prevalence:Prevalence is defined as the total number of all individuals who have an attribute or disease at a particular time or during a particular period divided by the population at risk of having the attribute or disease at this point in time or midway through the period. Although referred to as a rate, prevalence rate is really a ratio. Prevalence is of two types : a Point prevalence b Period prevalence When the term prevalence rate is used, without any further qualification, it is taken to mean point prevalence. 