Which Instruction Should the Nurse Give the Client with the Disease

Which instruction should the nurse give the client with the disease tuberculosis (TB) ?

A) "Don't worry, your disease is not contagious."
B) "You will need to be isolated until your sputum smear is negative."
C) "Once you start taking isoniazid, you will not be contagious."
D) "You will need to be isolated while you have an active cough."