With no explanation, label text_A→text_B with either "NOT ENOUGH INFO", "REFUTES" or "SUPPORTS".
text_A: The fall of Christendom 's major strongholds spread fear across central Europe .
text_B: Belgrade , with a garrison of only 700 men , and receiving no aid from Hungary , fell in August 1521.Imber , 49.The fall of Christendom 's major strongholds spread fear across central Europe .
SUPPORTS.