Isn't it a bit misleading for this course to teach this word to mean sausage, when in Food sausage was always ковбаса?
If a сосиска is to mean the type of thing you put in a hotdog bun, then in English it would be "wiener". If you're talking about the wiener and the bun together making the "hot dog", then that's what this answer should be.
Still, I don't know if it's wiener, or a hotdog. I do know that if it's sausage, we should have learned it in Food to mean sausage - that's if that's what it is.