Staff Reporter :Rapid Action Battalion (RAB) arrested four persons, including a doctor, from the capital’s Mohakhali DOHS area on Tuesday morning on the charge of leaking question papers of MBBS admission test.Three of them are Jasim Uddin alias Shovon, SM Sanowar and Akhtaruzzaman Khan Tushar. The identity of the other arrested person could not be known instantly, said Maksudul Alam, RAB Media Assistant Director.Shovon is the mastermind of the question paper leakage, he said.A team of RAB-2 arrested them for their alleged involvement in the leakage of question paper of the first year admission examination of MBBS, said the RAB official.They also recovered model question papers and answer sheets and Tk 38,000 in cash and cheques for Tk 1.20 crore from their possession.The mastermind was identified as Jasim Uddin Shovon.The MBBS 1st year admission test is scheduled to be held at different centres across the country on Friday.