Final answer:
Relative Risk Reduction does not necessarily show the true effect of a treatment as it may exaggerate the benefits by focusing on proportional changes in risk.
Step-by-step explanation:
The Relative Risk Reduction (RRR) does not always reflect the true magnitude of a treatment effect; it often overestimates a benefit of a particular treatment. The correct completion of the sentence is: Relative Risk Reduction (RRR) does not reflect the TRUE magnitude of treatment effect; it often overstates the benefit of a particular treatment. The issue with RRR is that it considers only the proportionate change in risk rather than the absolute risk, which can make the treatment effect appear more significant than it really is.