Chennai, Dec 19 : Karnataka youngster Karun Nair and Ravichandran Ashwin continued to frustrate England as India posted 582/5 at tea, to take a slender 105-run lead on the penultimate day of the fifth and final cricket Test here on Monday. [NK Cricket] Nair, who notched his maiden ton in the morning session of play, carried on to go past the 150-run mark as he and Ashwin forged a 147-run unbeaten stand for the sixth wicket to defy any inroads by the visitors at the M.A. Chidambaram Stadium here.