The Clue BSE : Sensex :: ___ : Nifty
The Answer NSE
BSE stands for Bombay Stock Exchange, which is closely associated with the Sensex index. Similarly, NSE stands for National Stock Exchange, and it is linked to the Nifty index. Both Sensex and Nifty are stock market indices that represent the performance of a group of stocks. Thus, NSE is the correct answer as it matches the relationship between BSE and Sensex.