With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: John Stewart appeared in Marvel comics.
text_B: Ophiosphaerella is a genus of fungi in the family Phaeosphaeriaceae .. Phaeosphaeriaceae. Phaeosphaeriaceae. genus. genus. fungi. fungi. The genus was described by Italian-Argentinian botanist and mycologist Carlos Luigi Spegazzini in 1909 .. genus. genus. Carlos Luigi Spegazzini. Carlos Luigi Spegazzini. Several species are pathogens of turfgrass , causing darkly pigmented hyphae on roots known as `` dead spot '' .. pathogens. plant pathogen. turfgrass. turfgrass. Ophiosphaerella korrae , O. narmari , and O. herpotricha affect bermudagrass -LRB- Cynodon species -RRB- , while the latter fungus also causes dead spot in buffalo grass -LRB- Bouteloua dactyloides -RRB- .. O. herpotricha. Ophiosphaerella herpotricha. O. narmari. Ophiosphaerella narmari. Ophiosphaerella korrae. Ophiosphaerella korrae. bermudagrass. bermudagrass. buffalo grass. buffalo grass. Ophiosphaerella korrae is a cause of necrotic ring spot in creeping red fescue -LRB- Festuca rubra -RRB- .. Ophiosphaerella korrae. Ophiosphaerella korrae. creeping red fescue. Festuca rubra
not_related.