<prompt> For assembling cohos for Coho study, all of the following considerations are considered exceptThe coho must be free from the disease under the studyStudy and control cohos should be equally susceptible to disease under studyBoth groups should be comparable in respect of all the possible variableThe diagnostic and eligibility criteria of the disease must be defined after the staing of research  <response>: The diagnostic and eligibility criteria of the disease must be defined beforehand; this will depend upon the availability of reliable methods for recognizing the disease when it develops. The groups are followed, under the same identical conditions, over a period of time to determine the outcome of exposure in both the groups. Remaining all options are considerants of coho study. 