The client is diagnosed with tuberculosis and prescribed rifampin and isoniazid (INH), both antituberculosis medications. Which instruction is most important for the public health nurse to discuss with the client?

A The client will have to take the medications for nine (9) to 12 months. C Explain the client cannot eat any type of pork products while taking the medication. B The client will have to stay in isolation as long as he or she is taking medications. D The urine may turn turquoise in color, but this is an expected occurrence and harmless.