"Its a matter of shame that the party (BJP) which claims to be the world's largest political party does not have a face whom it can project as its chief ministerial face for the polls," he quipped in a tweet.
Prasad's poser to the BJP comes a day after its senior leaders - Union Chemicals and Fertilizers Minister Ananth Kumar and former Bihar Deputy Chief Minister Sushil Kumar Modi - had evaded the issue when confronted by mediapersons.
Sushil Kumar Modi, who was the deputy chief minister for eight years under the incumbent Chief Minister Nitish Kumar, said the party's central leadership will take a call at an appropriate time on whether to project a chief ministerial face or go with collective leadership in the assembly polls.
Prasad, who had declared last week that senior JD(U) leader Nitish Kumar will be the secular alliance's chief ministerial candidate for the upcoming assembly polls, has been riling the BJP to name its face for the crucial polls.