Fifth District Congressman Glenn "G-T" Thompson and 63rd District State Representative Donna Oberlander were the guest speakers for Thursday's Clarion County Economic Development Corporation's Eggs And Answers event.     Congressman Thompson told those attending the gathering, at the Clarion area Holiday Inn hotel, that he is pleased with the positive economic development which is unfolding with a growing Marcellus Shale natural gas drilling boom.     Meanwhile, Representative Oberlander says we could be on the way to some major economic growth here with the first signs of the startup of the gas industry here.