feat(code_structure): add mcq (#145)

Author: amyheather

pages/guide/setup/code_structure.qmd

@@ -341,6 +341,102 @@ Normally, a mix of programming paradigms will be used.
 
 ## Test yourself
 
+<div class="h3-tight"></div>
+
+### Quiz
+
+```{r}
+#| echo: false
+library(webexercises) # nolint: library_call_linter
+```
+
+:::: {.python-content}
+
+::: {.callout-note}
+
+## Why do we recommend using functions and classes, instead of copying and pasting code?
+
+```{r}
+#| output: asis
+#| echo: false
+cat(longmcq(c(
+  answer = paste0(
+    "Because small, reusable functions/classes make code more modular, ",
+    "easier to read, test, and maintain, and avoid duplication."
+  ),
+  paste0(
+    "Because as long as logic is in functions or classes, it doesn't matter ",
+    "if there is a lot of duplicated code."
+  )
+)))
+```
+
+:::
+
+::: {.callout-note}
+
+## In the Python `Patient` class, what is the purpose of the `__init__` method?
+
+```{r}
+#| output: asis
+#| echo: false
+cat(longmcq(c(
+  "To automatically run every hour and update all patients in the system.",
+  answer = paste0(
+    "It initialises a new `Patient` object by setting attributes such as ",
+    "`patient_id`, `arrival_time`, and the initial `status`."
+  ),
+  "To delete the patient from the queue when they arrive at the hospital."
+)))
+```
+
+:::
+
+::::
+
+:::: {.r-content}
+
+::: {.callout-note}
+
+## Why do we recommend using functions, instead of copying and pasting code?
+
+```{r}
+#| output: asis
+#| echo: false
+cat(longmcq(c(
+  answer = paste0(
+    "Because small, reusable functions make code more modular, ",
+    "easier to read, test, and maintain, and avoid duplication."
+  ),
+  paste0(
+    "Because as long as logic is in functions, it doesn't matter ",
+    "if there is a lot of duplicated code."
+  )
+)))
+```
+
+:::
+
+::: {.callout-note}
+
+## In the R `estimate_wait_time` example, what does the function return?
+
+```{r}
+#| output: asis
+#| echo: false
+cat(longmcq(c(
+  "A list containing duration, status, and a vector of results.",
+  answer = "A single numeric value: the estimated total wait time.",
+  "A data frame with one row per patient and their individual wait time."
+)))
+```
+
+:::
+
+::::
+
+### Activity
+
 ::: {.python-content}
 
 **Task: Refactor the provided script into a function or class and put it on GitHub**. To do this, you should:
@@ -468,7 +564,7 @@ print(results)
 
 ::::
 
-:::: {.callout-tip title="Solutions" collapse="true"}
+:::: {.callout-tip title="Click to view solutions" collapse="true"}
 
 ::: {.python-content}