Tom is a hard-working boy. (他宁愿呆在图书馆学习而不去跳舞) ______ on weekends.

A．Pilots and truck drivers work in safer environments than that of doctors.
B．Patients can choose the sleeping hours of their doctors.
C．Patients are facing more risks if their doctors are not adequately-rested.
D．People concerned have the right to remove their doctors from their positions.

A) medical C) surgical
B) acute D) sharp