Sensex, Nifty open flat
Benchmark stock indices on Thursday opened on a cautious note ahead of the expiry of January series futures and options contracts. The BSE Sensex was trading lower 44.50 points, or 0.12 per cent, at 36,117.14. NSE's Nifty50 fell 13 points, or 0.12 per cent, to 11,073.