<prompt> All of the following statements regarding case control and coho studies are true, except-Coho studies are chosen based on history of ExposureCoho studies require longer time frame than case control studiesCoho studies are suitable to investigate rare diseaseCoho studies yield information about more than one disease  <response>: Case-control study is useful to investigate rare diseases or diseases about which little is known. But a disease which is rare in the general population e.g, leukemia in adolescence may not be rare in special exposure groups e.g prenatal X- rays refer pgno:74 park 23 rd edition 