NEW YORK (Reuters) – Federal Reserve Chairman Ben Bernanke's dour assessment of the U.S. recovery hit stocks on Wednesday, as his comment that the economy faced "unusually uncertain" prospects rattled investors. Stocks tumbled after Bernanke acknowledged the labor market's continued weakness while offering few specific options to stimulate lending and investment. "The market sold off because unfortunately there is no remedy provided in Bernanke's commentary to the rising threat of deflation, the excess capacity in the economy and the malfunctioning of the credit system," said Joe Battipaglia, market strategist at Stifel Nicolaus in Yardley, Pennsylvania. "We are now giving up...