Mulayam Singh Yadav-led Samajwadi Party on Thursday decided to quit the Grand Alliance in poll-bound Bihar, saying it cannot acept the five seats alloted to the party in the 243-member Assembly elections, due by November this year.

"Nobody was happy with the five seats given to the Samajwadi Party. There was a lot of resentment within the party and in Bihar over the decision," Samajwadi Party leader Ramgopal Yadav told reporters in Lucknow. "We got to know about the seats from the media," he said.

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The Samajwadi Party's decision is a big blow to the ambitious Grand Alliance formed by the former Janata Parivar parties to take on a resurgent BJP in the critical Bihar elections, being seen as the next big test for Prime Minister Narendra Modi after the Delhi disaster.

"When was the Janata Parivar ever together?" Yadav asked. That despite his chief, Mulayam Singh Yadav, playing the biggest role in bringing arch enemies Nitish Kumar and Lalu Yadav together as well as forging the secular alliance of the five parties.

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The Janata Dal-United (JD-U) and Lalu Prasad-led Rashtriya Janata Dal have been alloted 100 seats each while the Congress got 40. The Nationalist Congress Party, which was alloted the remaining three, has also protested the decision and is expected to reject the offer.

On Sunday, Lalu, Nitish and Congress president Sonia Gandhi attended a massive Swabhiman rally in Patna's Gandhi Maidan , where the RJD supremo had offered five seats to the Samajwadi Party from his own quota.