<prompt> Translate the following text to SwahiliThey also prefer the use of highly controlled diagnostic and demographic groups in order to obtain unambiguous answers to isolate the active ingredient of treatment efficacy.  <response>: Pia wanapendelea kutumia makundi ya utambuzi na idadi ya watu yaliyodhibitiwa sana ili kupata majibu ya wazi ili kutenganisha kiungo hai cha ufanisi wa matibabu. 