By Bansari Mayur Kamdar and Devik Jain (Reuters) -Megacap companies dragged U.S. stock indexes lower on Thursday after a hotter consumer prices reading and comments from St. Louis Federal Reserve Bank President James Bullard raised fears the Fed will act aggressively to counter inflation. The Labor Department data showed consumer prices surged 7.5% last month on a year-over-year basis, topping economists’ estimates of 7.3% and marking the biggest annual increase in inflation in 40 years. Bullard, a voting member of the Fed’s rate-setting committee this year, said the data had made him “dramati…