Asking Yadav what had happened to the issue of iron ore fines, the Parliamentary Affairs Minister said the "pinkness on your face is visible", without elaborating it.
Singh's swipe came during the course of his replies in the House and was in response to Yadav's digs at the government during his speech against the Motion of Thanks.
The issue of fines had disrupted one of the sessions in the previous House.
In his speech, Yadav had asked whether the government would recommend for CBI probe against mining of minor mineral (sand).
