Text: When Boris was at De Witt Clinton High School in New York, in the '30s, his history teacher once remarked that in February 1917, Alexander Kerensky had made the Russian Revolution and was soon after overthrown by Lenin.
Entailment: Boris, when he was in high school in the '30s, was reminded by his history teacher about the consequences of the Russian Revolution.
Contradiction: Boris, when he was in high school in the '30s, was reminded by his maths teacher about the consequences of the Russian Revolution.