<prompt> One of the following is not a characteristic of casual association-CoherenceSpecificitySensitivityBiological plausibility  <response>: Assosciations can be broadly grouped under 3 headings: Spurious association Indirect association Direct association, which consists of a one to one causal association and b multifactorial causation Ref: 25th edition, Parks Textbook of Preventive and Social Medicine, Page no. 95 