听力原文：Welcome to the Saint Mary' s Hospital. My name is Senior Nurse Betty Nason, and I

am here to present the first-year nurse's orientation. As fresh graduate nurses, you will all be assigned a mentor from the senior staff. Your mentor will be there to guide you through your first few months in the hospital. You will also be subject to monthly evaluations conducted by me and your respective mentors. You will be evaluated on a number of factors, including bedside manners, understanding the patients' needs, punctuality, professionalism and your ability to conform. to the rules of the hospital. Your pay raises will be based on successful evaluations. Now follow me as I show you to the staff room and your lockers.

Who is the orientation directed at？

A．Graduate nurses

B．Senior doctors

C．School teachers

D．Chartered accountants