With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Islam had a prophet named Muhammad.
text_B: Mark Cook may refer to  :. Mark Cook -LRB- musician -RRB- , American songwriter and keyboardist. Mark Cook -LRB- footballer -RRB- -LRB- born 1988 -RRB- , English football goalkeeper
not_related.