My point is what kind of Doctor is he. Professors in college are sometimes called Doctors, and then you have specific types of Doctors.
He's claimed to be a doctor of "practically everything" (Spearhead From Space
), and does hold the Time Lord equivalent of a doctorate (The Armageddon Factor
), and an Earthly one, having studied under Joseph Lister (The Moonbase
). It's also been claimed that he chose his title to reflect his desire to "make people better" (The Sound of Drums