The market benchmark Sensex added to its yesterday's rally by gaining 57 points today and the NSE Nifty pulled off a nearly 6-month closing high on increased buying in oil and gas and IT amid persistent foreign inflows and solid quarterly numbers so far. The 50-share NSE Nifty rose 17.25 points, or 0.22 per cent, to 7,979.90 at the close -- its biggest closing since November 4, 2015.