The Sensex at the Bombay Stock Exchange opened 57 points, or 0.3 per cent higher, this morning, at 18,077, ahead of the Reserve Bank's quarterly credit policy review. The Sensex later gained further ground, and stood 84 points, or 0.5 per cent in the green, at 18,104, after the central bank's monetary policy review proved more-or-less in line with market expectations. Reacting positively to the moderate rate hike announced by the RBI, shares of rate-sensitive bank, auto and realty companies gained ground. Meanwhile, key stock indices in Japan, China, Singapore, Hong Kong, South Korea and Taiwan were trading mixed, today.