Tourism and Culture Minister Nazri Abdul Aziz must answer where the billions of ringgit that landed in Prime Minister Najib Abdul Razak's personal bank accounts came from during his debate with Dr Mahathir Mohamad.

According to DAP lawmaker Tony Pua, this would be the most important question Nazri should address.

Pua also said Nazri's answers on the issues raised, including the 1MDB scandal, would be considered as representing the government's stand.

“If he answers wrongly, that's his business, not ours,” he told a press conference in Parliament.

“So I hope he comes prepared with the facts to answer the collosal loss and where the billions went,” added the Petaling Jaya Utara MP, who is a staunch critic of the 1MDB affair.