With no explanation, label text_A→text_B with either "NOT ENOUGH INFO", "REFUTES" or "SUPPORTS".
text_A: The killer whale is a river dolphin .
text_B: The killer whale or orca -LRB- Orcinus orca -RRB- is a toothed whale belonging to the oceanic dolphin family , of which it is the largest member .
REFUTES.