In the question below choose the word(s) or phrase(s) which best fill(s) the gap:
Ladies and gentlemen, our guest speaker, Dr. Oni …. also a resident doctor at the teaching hospital.
The correct answer is: D
Explanation
"Ladies and gentlemen, our guest speaker, Dr. Oni, is also a resident doctor at the teaching hospital."
"Is" completes the sentence correctly by linking the subject ("Dr. Oni") with the additional information ("also a resident doctor at the teaching hospital").
"Who is" would turn the clause into a relative clause and make the sentence dependent and thus incomplete without further restructuring.