Concept:The pair shows a state and a well-known city located in that state.Explanation:Thrissur is a major city in Kerala.Check the options:Ahmedabad is in Gujarat, not Punjab.Bokaro is in Jharkhand, not Chhattisgarh.Durgapur is in West Bengal.Nashik is in Maharashtra, not Odisha.So, West Bengal : Durgapur follows the same relationship.Answer:West Bengal : Durgapur