With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Maria Sharapova is a woman who plays tennis.
text_B: In enzymology , a biochanin-A reductase is an enzyme that catalyzes the chemical reaction. enzymology. enzymology. enzyme. enzyme. catalyzes. catalysis. chemical reaction. chemical reaction. dihydrobiochanin A + NADP + biochanin A + NADPH + H +. dihydrobiochanin A. dihydrobiochanin A. biochanin A. biochanin A. NADPH. nicotinamide adenine dinucleotide phosphate. Thus , the two substrates of this enzyme are dihydrobiochanin A and NADP + , whereas its 3 products are biochanin A , NADPH , and H + .. enzyme. enzyme. substrates. substrate ( biochemistry ). dihydrobiochanin A. dihydrobiochanin A. products. product ( chemistry ). biochanin A. biochanin A. NADPH. nicotinamide adenine dinucleotide phosphate. This enzyme belongs to the family of oxidoreductases , specifically those acting on the CH-CH group of donor with NAD + or NADP + as acceptor .. enzyme. enzyme. The systematic name of this enzyme class is dihydrobiochanin-A  : NADP + Delta2-oxidoreductase .. enzyme. enzyme. oxidoreductase. oxidoreductase. systematic name. List of enzymes. This enzyme participates in isoflavonoid biosynthesis .. enzyme. enzyme. isoflavonoid biosynthesis. isoflavonoid biosynthesis
not_related.