You'll have to do better than that. There are a lot of doctors in the world and you'll be shocked to know that they don't all agree on everything. Surely some must be wrong. Same with all scientists.
The question is whether your particular doctor is right on this particular issue.

__________________
"Man lives in the sunlit world of that which he believes to be reality. But unseen by most is an underworld, a place that is just as real... but not as brightly lit... A DARK SIDE!"
-opening from Tales From the Darkside