Premise: Elizabeth II ( Elizabeth Alexandra Mary ; born 21 April 1926 ) has been Queen of the United Kingdom , Canada , Australia , and New Zealand since 6 February 1952 . In October 2016 , she became the longest currently reigning monarch and head of state following the death of King Bhumibol Adulyadej of Thailand . In 2017 she became the first British monarch to commemorate a Sapphire Jubilee .
Hypothesis: Elizabeth II was queen at the time of the 9/11 disaster.
Label: ENTAILMENT