A Registered Nurse Is Teaching a Student Nurse About Assessing

A registered nurse is teaching a student nurse about assessing the results of a Mantoux test administered to an adolescent client. The results exhibit a 5-mm tissue induration. Which statement made by the student nurse indicates effective learning?

A) "The client has an active case of tuberculosis (TB) ."
B) "The client has had an exposure to TB."
C) "The client has not had an exposure to TB."
D) "The client should be given TB vaccine immediately."