The thin gentlemen answer questions using?

The answer to your questions is synonyms.

Example from the text:

And, from across the square, five very tall, thin gentlemen regally dressed in silks and satins, plumed hats, and buckled shoes rushed up to the car, stopped short, mopped five brows, caught five breaths, unrolled five parchments, and began talking in turn.

"Greetings!"

"Salutations!"

"Welcome!"

"Good Afternoon!"

"Hello!"