We always [almost always ??] use a singular verb in cases like this, Ana. What the answer is has no bearing on how to pose the question for in real life the answer is unknown before a question is asked.
When the question includes a reference to a plural, then we use a plural verb.
Who are the people going to ... ?
Check this Google exact search page for some more exmples.
"who are" - Google Search
Student or Learner