(a) the basis on which the sales tax rebate eligibility certificate is issued for the sale of high speed diesel and other petroleum products alongwith the status of the officer authorised to issue such a certificate;
(b) whether complaints with regard to the misuse of it in certain cases have been received during the last three years; and
(c) if so, the reaction of the Government thereon; and
(d) the steps taken to prevent recurrence of such incidents in future?