Who of the following was sent as representative of labourers by Indian Government in the Washington Summit of I.L.O. in the year 1919?

The official (provisional) key gives V.P. (B.P.) Wadia, founder of the Madras Labour Union (1918), as the answer. Note: most standard sources name N.M. Joshi as the workers' delegate nominated to the 1919 ILO conference in Washington, so check this against UPPSC's final key.