A nurse is caring for a client who has active pulmonary tuberculosis (TB) and a new prescription for rifampin (Rifadin). The nurse should instruct the client that they should expect which of the following clinical manifestations while taking this medication?

A. Black-colored stools may indicate gastrointestinal bleeding, which is not a common side effect of rifampin. B. Rifampin is known to cause orange-colored secretions, including urine, sweat, and tears, which is a normal and expected side effect. C. Rifampin does not typically cause staining of teeth; this is more commonly associated with other medications like tetracyclines. D. Constipation is not a recognized side effect of rifampin, and patients are not typically advised to expect this as a result of the medication.