<prompt> Confounding factor is associated with:-Exposure onlyOutcome onlyBoth exposure and outcomeNeither exposure nor outcome  <response>: Confounding factor Any factor associated with both exposure, outcome and has an independent effect in causation of outcome is a confounder. BEST METHOD TO REMOVE CONFOUNDING:- MATCHING - Removes confounding bias by distributing known confounding factors equally in two groups RANDOMISATION2ND BEST RESTRICTION STRATIFICATION STATISTICAL MODELLING MULTIVARIATE ANALYSIS STRATIFIED RANDOMISATION BEST METHOD 