Step 1: Understanding the Concept
Acute phase proteins (APPs) are plasma proteins made mainly by the liver whose levels rise quickly in infection or injury, as part of innate immunity.
Step 2: Check the options
C-reactive protein, mannose-binding protein and \(\alpha\)-1 acid glycoprotein are APPs.
Step 3: The exception
Erythropoietin is a kidney hormone that stimulates red blood cell formation, so it is not an APP.
Final Answer:
Erythropoietin is not an acute phase protein.
\[ \boxed{\text{(D) }\text{Erythropoietin}} \]