In this task, you need to answer 'Yes' if the given word is the longest word (in terms of number of letters) in the given sentence, else answer 'No'. Note that there could be multiple longest words in a sentence as they can have the same length that is the largest across all words in that sentence.

Sentence: 'a person is holding a black cellphone in their hand'. Is 'a' the longest word in the sentence?
No

Sentence: 'two red street signs are posted on a building'. Is 'on' the longest word in the sentence?
No

Sentence: 'a field with snow animals in the background and clouds in the sky'. Is 'background' the longest word in the sentence?

Yes