Question

Q. ___ est-ce que tu telephones?
A. Je telephone à Claudine.
What is the question word?

Answer 1

Qui

If you translated the question and Answer, it would be

Q. ___ are you telephoning?

A. I call Claudine.

The blank will be "Who"

Who in french is Qui.

Final answer

Qui

Answer 2

the question word is qui