Snapping a five-day rally, the Sensex at the Bombay Stock Exchange lost 85 points, or 0.5 percent, to 17,622, today, on profit-booking by investors, after a low economic growth forecast for this fiscal, and subdued global markets. The Nifty at the National Stock Exchange fell 27 points, or 0.5 percent, to 5,335.Key stock markets in Japan, China, Hong Kong, Singapore and South Korea ended mixed.