CBI sources said that Adhikari was interrogated for more than an hour.
He was the second Trinamool Congress MP after Srinjoy Bose, who was questioned by the CBI in the Saradha case apart from Kunal Ghosh who was already behind bars before the central investigating agency took charge of the probe.
Later after coming out of the CBI office, Adhikari told waiting reporters that he was called under Section 160 of CrPC.
The section authorises a police officer to call somebody if it appeared that the person seemed to be acquainted with the facts and circumstances of the case in question.