With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Tramadol may cause itchiness.
text_B: In finance and economics , the nominal interest rate or nominal rate of interest is either of two distinct things  :. interest. interest. the rate of interest before adjustment for inflation -LRB- in contrast with the real interest rate -RRB- ; or ,. interest. interest. inflation. inflation. real interest rate. real interest rate. for interest rates `` as stated '' without adjustment for the full effect of compounding -LRB- also referred to as the nominal annual rate -RRB- .. interest. interest. compounding. compound interest. An interest rate is called nominal if the frequency of compounding -LRB- e.g. a month -RRB- is not identical to the basic time unit -LRB- normally a year -RRB- .. interest. interest. compounding. compound interest
not_related.