What does not belong? salivary amylase cholesterol antibodies hemoglobin?

I believe that the correct answer is cholesterol. Salivary amylase, antibodies, and hemoglobin are all proteins. Salivary amylase is the enzyme produced by the salivary glands that digests starch, antibodies are proteins produced by plasma cells in response to a specific antigen, and hemoglobin is the protein component of red blood cells. Cholesterol is a steroid and therefore cannot be categorized with the other three.