This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Confounding and Bias, Subject name: Social & Preventive Medicine
[{'content': 'Confounding factor is associated with:- \nSelect and explain. \nA. Exposure only, B. Outcome only, C. Both exposure and outcome, D. Neither exposure nor outcome', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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 RANDOMISATION(2ND BEST) RESTRICTION STRATIFICATION STATISTICAL MODELLING/ MULTIVARIATE ANALYSIS STRATIFIED RANDOMISATION (BEST METHOD)', 'role': 'assistant'}]