A Person Scheduled for a Test for Glycosylated Haemoglobin (HbA1c)level

A person scheduled for a test for glycosylated haemoglobin (HbA1c) level asks about the purpose of the test. How should the nurse respond to this person?

A) 'It's to check for pituitary functioning.'
B) 'It's a blood test to check for thyroid dysfunction.'
C) 'It's a blood test to check for adrenal functioning.'
D) 'It's to check for pancreas functioning.'