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 planes sitting parked on the cement with a mountain in the background'. Is 'planes' the longest word in the sentence?
Example Output: No

Example Input: Sentence: 'a bridge with a clock tower in the background'. Is 'background' the longest word in the sentence?
Example Output: Yes

Example Input: Sentence: 'a bed sitting under a window next to a chair'. Is 'under' the longest word in the sentence?
Example Output:
No