Which of the following is not a secondary metabolite?

Lecithin is a phospholipid. It is a crucial component of cell membranes, and it is involved in various cellular functions, such as cell signalling and lipid metabolism. It is classified as a primary metabolite. Curcumin (a compound found in turmeric), morphine (an alkaloid found in opium poppy) and anthocyanin (a water soluble pigment found in plants) are classified as secondary metabolites. These are organic compounds produced by plants, fungi or microorganisms that are not directly involved in essential metabolic processes but often play roles in defense, communication or attraction.