<prompt> Crude bih rate is a simplest measure of feility because it includesTotal populationMid year populationLive bihs onlyPre term bihs  <response>: Crude bih rate : Number of live bihs in a year per 1000 mid-year population CBR is simplest indicator of feility : Total mid-year population is not exposed to Child bearing thus it doesnot give true idea of feility Ref: Park 25th edition Pgno : 539 