I'm glad to see that more and more people are realizing that doctors are regular people just as everyone else. Because of this, they are (exceptionally) prone to giving in to their pride when asked a question that they don't know the answer to.

Instead of saying those three beautiful words that we all long to hear from time to time, they give in to their pride and make up an answer off the top of their heads, which can be—and often is—harmful.

Those three beautiful words are, "I don't know".

When a doctor says this, you can be pretty sure he's an honest person.