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.

Example Input: Sentence: 'two young boys on horses wearing pith helmets'. Is 'pith' the longest word in the sentence?
Example Output: No

Example Input: Sentence: 'a street light with trees and a sky background'. Is 'background' the longest word in the sentence?
Example Output: Yes

Example Input: Sentence: 'a birthday cake on a board has a train on top'. Is 'a' the longest word in the sentence?
Example Output:
No