I want to add a Drop down "Box" in my wordpress. Is there a Plugin for it?

Hi, i have this medical website and sometimes i post medical related questions. I like to include the answer into the post but i dont want to just post the answer there. So i need a plugin or something that lets me put a something like “Click here to view the answer” and once someone clicks on it there is a small drop down box that reveals the answer. I hope this makes sense!

Here is a sample of my website:
https://www.medical-institution.com/medical-question-7-deep-vein-thrombosis-management-usmle-step2/

And here is another website that actually has what i’m looking for:
https://www.medicalcase4u.com/what-is-the-diagnosis-2/

I really appreciate it if someone can guide me in the right direction.

Thank you ??