R markdown PDF: Temporarily hide spoiler code for quiz takers

Question

I am using R markdown to create a PDF R course. I want to insert a quiz like the following:

---
output: pdf_document
---

What is the class of the following R ob         


        

Answer 1

I wasn't thinking of a full shiny app, but something like this .Rmd

---
output: html_document
---

## q1 what is `class(pi)?`



```{r}
class(pi)
```




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And then to click