Equity benchmark indices Sensex and Nifty nosedived on Monday after two consecutive days of gains, as investors rushed to take profits amid the unabated selling of stocks by foreign investors.Photograph: Francis Mascarenhas/ReutersAnalysts said investors turned defensive ahead of this week's US Federal Reserve policy decision, which further weakened the sentiment. The 30-share BSE Sensex plunged by 609.68 points, or 0.71 per cent, to close at 85,102.69.During the day, it plummeted by 836.78 points, or 0.97 ...