Mukul Roy, who recently switched to the ruling TMC in Bengal, has been appointed as the chairperson of the important Public Accounts Committee (PAC) in the Assembly by Speaker Biman Banerjee. Raising questions over Mukul Roy's appointment as the PAC chairperson in the West Bengal Assembly, BJP MLAs, led by leader of the opposition Suvendu Adhikari, staged a walkout in the House on Friday.