TORONTO, Dec 15 (Reuters) - Toronto’s main stock index opened lower on Tuesday, pulled down by financial stocks including Royal Bank of Canada (RY.TO), which fell after U.S. data raised inflationary fears and concerns lingered about Europe’s banking sector. The S&P/TSX composite index .GSPTSE was up 32.14 points, or 0.28 percent, at 11,513.55. (Reporting by Irene Kuan; Editing by Jeffrey Hodgson)