AP EAMCET Medical 2016 Paper

In a series of reactions during carbon fixation, 'A', a six carbon compound reacts with a three carbon compound to gives rise 'B', a four carbon compound and 'C\ five carbon compound. 'B' reacts with a three carbon compound to form D, a seven carbon compound. 'D' reacts with a triose to form two molecules of'E', five carbon compounds.Identify reactant with 'B' and enzyme involved in the formation of'D' respectively