How do I tell students that they’re not going to be doctors?

Curriculum for a 10th grade class that I teach has us looking at careers. Many of my students have long standing issues with attendance and therefore reading and writing, but they insist that they want to do another 12+ years of schooling to be surgeons and pediatricians.

What’s the best way to get them to look at something that may actually fit into a path that is more suitable? Just have them research a plan B and C career? I don’t want to crush their spirit, but being unrealistic isn’t helpful either.

Edit: I have no plans on telling anyone what they can and can’t be. Post should have been titled something like “How to have students analyze broader career options?”