<prompt> Which of the following is true about coho study?Disease to risk factor studyEffect to cause studyNot associated with attributable riskAssociated with antecedent causation  <response>: A coho study is a paicular form of longitudinal study that samples a coho a group of people who share a defining characteristic, typically those who experienced a common event in a selected period, such as bih or graduation, performing a cross-section at intervals through time. Ref: 25th edition, Parks Textbook of Preventive and Social Medicine, Page no. 83 