In dtkaplan/etude: Utilities for Handling Textbook Exercises with Knitr

# indicate correct choices with +_+ in the name of the list item.
etude::choose_one(
  prompt = "Which of these letters is a vowel?",
  choices = list(
    "+A+" = "",
    "B" = "B's a consonant, Bub.",
    "C" = "C is a consonant, Chub",
    "D" = "D is a consonant, Dear",
    "+E+" = ""
  )
)