With no explanation, label text_A→text_B with either "NOT ENOUGH INFO", "REFUTES" or "SUPPORTS".
text_A: Nobby 's brother works for MI5 .
text_B: Upon hearing of his location , Nobby sets off to reunite with his brother , unaware that not only is his brother an MI5 agent , but he 's just uncovered a plot that puts the world in danger .
SUPPORTS.