A Child with Osteomyelitis Asks the Nurse,"What Is a 'Sed

A child with osteomyelitis asks the nurse,"What is a 'sed' rate?" What is the best response for the nurse?

A) "It tells us how you are responding to the treatment."
B) "It tells us what type of antibiotic you need."
C) "It tells us whether we need to immobilize your extremity."
D) "It tells us how your nerves and muscles are doing."