CHENNAI: DMK Lok Sabha member from Central Chennai and former Union minister Dayanidhi Maran on Tuesday taunted Prime Minister Narendra Modi and sought a white paper on Covid-19 measures undertaken by the Centre. "If #PMCares, he should be transparent with the nation & present white paper on - oxygen production & supply to states, availability of Remdisivir, vaccine production, supply & planning and development of medical infrastructure in last year," Maran tweeted. He also sought to know the usage of the "global aid", by tagging his tweet with #NationWantsToKnow.