Ans.
Lipids are a class of biomolecules, made up of fatty acids and fatty acid derivatives. Lipids are non-polar, water insoluble organic compounds, which include fats (triglycerides), steroids, phospholipids, and natural oils. Lipids play role in different functions, such as in membrane synthesis (phospholipids), energy storage (fats), and signalling (steroids).
Thus, the correct answer is option) 'lipids.'