New Delhi, April 15 -- The Congress on Tuesday expressed grave concern over the rising prices of domestic gas cylinder and overall inflation and called for special session of Parliament to discuss the issue. Addressing a press conference here, All India Mahila Congress president Alka Lamba asked the government to "release a white paper" on inflation. Lamba said, "In 2014, prices of domestic cylinder was Rs 414, and it included a government subsidy. But now, with the subsidy removed, the price of cylinder has risen to Rs 1,103. We want to ask - BJP had promised to provide gas cylinders for Rs 450 in Rajasthan. where is promised that cylinder?" Stating that the Congress is holding protest across the country against inflation, Lamba said, "Tir...