Dr. Saul treated Frederick for chronic bronchitis, but it was later proven that Frederick actually had emphysema. This mistake
in determining what was wrong with Frederick is
an imaging error.
a diagnostic error
a medication error.
a surgical error

I believe that it is a diagnostic error

Explanation: A surgical error cannot be it because it talks about the side effects like discomfort or the conditions is causing the patient to deteriorate instead of improving. If it is an imaging error, chances are it can be it but you are usually are trying identifying the signs and symptoms. Chronic bronchitis is the inflammation of the bronchial tubes. Emphysema has a different defitition even though it has few symptoms that has in common such as shortness of breath. Emphysema is a condition that causes shortness of breaths. However, the air sacs (alveoli) are damaged. If it is a medication error, then the signs and symptoms that the patient is trying to manage is not very effective. Medication error, imaging error and surgical error scratches it out. So therefore, a diagonstic error should be correct. Hope you find these helpful

answer: proteins

explanation: complement is   system of circulate in the blood in a inactive form

i believe is what you're looking for?