Question: Point out the correct definition: 
 Options:  <1> The Necessary Number to Treat (NNT) is the inverse of the Relative Risk (RR). <2> The Relative Risk Reduction (RRR) can clearly differentiate the big risks and benefits of the small ones. <3> The Relative Risk Reduction (RRR) is a measure of the therapeutic effort that clinicians and patients must make to avoid negative results of their illnesses. <4> The Number Necessary to Damage (NND) is calculated by dividing the unit by the Number Needed to Treat (NNT). <5> The Absolute Risk Reduction (RRA) is calculated by the absolute difference of the episode rate in the control group minus the episode rate in the intervention group.
5