With no explanation, label text_A→text_B with either "NOT ENOUGH INFO", "REFUTES" or "SUPPORTS".
text_A: Maria Sharapova passed all drug tests at the 2016 Australian Open .
text_B: In March 2016 , Sharapova revealed she had failed a drug test at the 2016 Australian Open on January 26 , 2016 .
REFUTES.