Concept:In a number series, find the intended pattern; the term that breaks it is the odd one out.Explanation:Write the series: 37,39,43,47,57.The differences suggest adding +2,+4,+6,+8.So the expected terms are 37,39,43,49,57.Here, 47 does not fit because 43+6=49.Answer:The odd term is 47 (Option C).