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MsEducated
In Act IV, Iago references his "medicine," which is doing its work.

He is referring to the rumors he started involving Desdemona. He says that this "medicine" is the way to catch "credulous fools" -- meaning that Othello is gullible enough to believe the lie Iago started. 

With his medicine, or his lies, Iago is bringing about Othello's destruction. He is happy to see Othello believing Desdemona is unfaithful.
jayilych4real

The thing that Iago is referring to is the rumors that he started which involve Desdemona.

What is a Narration?

This refers to the storytelling that is made with the aid of a narrator to show the events that occurred.

Hence, we can see that from the complete text, there is the use of narration to show that he had set a trap as a way to catch some people such as Othello and this was important to him.

Read more about narrations here:

https://brainly.com/question/1934766

#SPJ2

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