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: 'a man is riding on the back of an elephant'. Is 'is' the longest word in the sentence?
Example Output: No

Example Input: Sentence: 'a sheep checks out the hand of a young child'. Is 'checks' the longest word in the sentence?
Example Output: Yes

Example Input: Sentence: 'two guys training for a bicycle marathon'. Is 'marathon' the longest word in the sentence?
Example Output:
Yes