"Casteist remark is a breach of the EC guidelines for polls...The EC deal with such matters under its legal framework," Zaidi told reporters in reply to a question.
He said that the Election Commission would find out the details of the alleged casteist remarks by Prasad and take appropriate action.
The RJD supremo had yesterday described the crucial Assembly polls in Bihar as a direct fight between the backward castes and forward castes and given a call to Yadavas and other backward castes to rally behind the secular alliance to defeat the BJP-led NDA.