Given the task definition, example input & output, solve the new input case.
In this task you are given a sentence. You must judge whether the object of the main clause is singular(like: apple) or plural(like: apartments). Label the instances as "Singular" or "Plural" based on your judgment.
Example: They both let out relieved breaths at the doctor's words.
Output: Plural
"relieved breaths" is the object of the sentence which is plural.

New input case for you: On this day however, slight aggravation caused his iris to flood with deep storm clouds.
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Plural