A Nursing Student Asks a Nurse About Pharmaceutical Research and Wants

A nursing student asks a nurse about pharmaceutical research and wants to know the purpose of randomization in drug trials. The nurse explains that randomization is used to do what?

A) To ensure that differences in outcomes are the result of treatment and not differences in subjects
B) To compare the outcome caused by the treatment to the outcome caused by no treatment
C) To make sure that researchers are unaware of which subjects are in which group
D) To prevent subjects from knowing which group they are in and prevent preconception bias