You're doing an exchange semester in Germany and ask one of your professors about the assessment at the end of the semester. He tells you that most exchange students do a 25 minute oral exam at the end, but it really depends what your home university will recognize. The alternatives are a 10, 15, or 20 page essay or a written exam. You tell him that you'll ask your home university and let him know, but you're a little worried that they say they want you to do the written work instead.
Do you actually ask your home university? Or do you just tell him that the oral exam is fine? Why?
EDIT: wow! I'm kind of surprised at the answers but also not, since they pretty much come to the same conclusion that I did.