Funny Spanish exam question

I've been seeing this pic around the net and am wondering why it's funny.

>Examen de Historia
>1. Complete el enunciado:
>Simon Bolivar murió en ________
>
>Simon Bolivar murió enfermo

I know "enfermo" means sick. Is "Simon Bolivar died sick" the punchline, or am I missing something?

Edit:
See comments for explanation. Thanks everyone!