<prompt> Cause to effect progression is seen in all EXCEPT:Case control studyEcological studyCohort studyRandomized control trial  <response>: ANSWER: A Case control studyREF: Park 20th edition page 67 Repeat in December 2011Cause to effect disease prospective study cohort studyEffect disease to cause retrospective study case control studyRCT and ecological studies are also prospective studies 