<prompt> In a double-blind clinical drug trial:Each patient receives a placeboEach patient receives both double treatmentsThe patients do not know which treatment they are receivingThe patients do not know that they are in a drug trial  <response>: The double blind trial is so planned that neither the doctor nor the paicipant is aware of the group allocation and the treatment received. Ref: 25th edition, Parks Textbook of Preventive and Social Medicine, Page no. 91 