With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Michael Schumacher won a title in 2001.
text_B: In epidemiology , the absolute risk reduction , risk difference or absolute effect is the change in the risk of an outcome of a given treatment or activity in relation to a comparison treatment or activity .. epidemiology. epidemiology. risk. risk. It is the inverse of the number needed to treat .. number needed to treat. number needed to treat. In general , absolute risk reduction is the difference between one treatment comparison group 's event rate -LRB- EER -RRB- and another comparison group 's event rate -LRB- CER -RRB- .. risk. risk. The difference is usually calculated with respect to two treatments A and B , with A typically a drug and B a placebo .. placebo. placebo. For example , A could be a 5-year treatment with a hypothetical drug , and B is treatment with placebo , i.e. no treatment .. placebo. placebo. A defined endpoint has to be specified , such as a survival or a response rate .. endpoint. End point of clinical trials. survival. survival rate. response rate. response rate ( medicine ). For example  : the appearance of lung cancer in a 5-year period .. If the probabilities pA and pB of this endpoint under treatments A and B , respectively , are known , then the absolute risk reduction is computed as -LRB- pB − pA -RRB- .. risk. risk. endpoint. End point of clinical trials. probabilities. probability. The inverse of the absolute risk reduction , NNT , is an important measure in pharmacoeconomics .. risk. risk. pharmacoeconomics. pharmacoeconomics. If a clinical endpoint is devastating enough -LRB- e.g. death , heart attack -RRB- , drugs with a low absolute risk reduction may still be indicated in particular situations .. risk. risk. endpoint. End point of clinical trials. death. death. heart attack. myocardial infarction. If the endpoint is minor , health insurers may decline to reimburse drugs with a low absolute risk reduction .. risk. risk. endpoint. End point of clinical trials. health insurers. health insurance
not_related.