The CBI on Tuesday started questioning former railway minister Lalu Prasad in connection with the land for jobs scam case where people were allegedly given jobs in the railways in return for land parcels gifted or sold at cheap rates to the Yadav family and associates, officials said. The examination of the RJD supremo comes a day after his wife and former Bihar chief minister Rabri Devi was quizzed at her Patna residence by the agency for nearly five hours, they said. According to officials, a team of five CBI officials arrived in two cars at 10.40 am at the residence of Misha Bharti in Pandara Park on Tuesday where Prasad is currently residing and the questioning will continue during the day. The Central Bureau of Investigation (CBI) has already filed a charge sheet in the case against Prasad, Rabri Devi and 14 others under charges of criminal conspiracy and provisions of the Prevention of Corruption Act, in which all the accused have been summoned on March 15, they said.