Which additional word, if any, should be capitalized in the sentence?

Come with me; I'd like to introduce you to professor Gates.

a. professor

b. me

c. introduce

d. There is no error in capitalization.

The correct answer is letter a. professor. "Come with me; I'd like to introduce you to professor Gates" should be written as Come with me; I'd like to introduce you to Professor Gates. The word professor is something that is the same as Sir or Maam, Mr. or Mrs., Atty., Dr., etc.