The SENSEX Index dropped 183 points or 0.24 percent on Wednesday to close at 77473 points. Losses were led by Infosys (-1.84%), Power Grid (-1.77%) and Bharti Airtel (-1.70%). Offsetting the fall, top gainers were Kotak Mahindra Bank (3.70%), UltraTech Cement (2.04%) and Axis Bank (1.69%).