Indian markets opened cautiously on Monday, with the Nifty holding above 25,500. Mid-cap and small-cap indices outperformed, while PSU banks and pharma stocks led the gains. JB Pharma dropped 6% after Torrent buyout. Analysts have pegged the Nifty's support at 25,200-25,500 and resistance at 25,800-25,900. Global sentiment stayed upbeat as Asian markets rose and oil prices dipped.