You will be given a context and a verb separated with a newline character, and you have to answer if the given verb is a negation or not. A verb is a negation if it is not going to exist, not happen, or has no effect. The output should be "Yes" if the verb is a negation and "No" otherwise.

[Q]: The American ambassador to Kenya was among hundreds injured, a local TV said. It was definitely a bomb, said a U.S. Embassy official in Nairobi, who (refused) to identify himself.
Verb: refused
[A]: Yes

[Q]: U.S. Secretary of State Madeleine Albright paid tribute Tuesday to bombing victims and embassy staffers on a whirlwind visit to East Africa, and promised to track down the perpetrators. Together, we promise to (bring) to justice the murderers of our friends, she told American and Tanzanian workers at the bomb-hit U.S. Embassy in Dar es Salaam, Tanzania.
Verb: bring
[A]: No

[Q]: I formally object to the legal moves made or being made by those who are arbitrarily retaining Elian, Gonzalez said in the letter, dated Monday. In the letter, Gonzalez said he does not (recognize) the jurisdiction of theU.S. court system, which is weighing an attempt by Elian's Miami relatives to block his return to Cuba.
Verb: recognize
[A]:
Yes