Dan Is a Body Builder

Dan is a body builder. He decides that he is going to change his diet in an effort to increase his muscle mass. Dan tells you that he plans to eat vegetables and proteins but no fats or carbohydrates, because cells do not naturally contain these molecules and do not need them. You advise Dan that his new diet is not a good choice, and that he would do better to follow a well balanced diet that incorporates healthy amounts of proteins, fats AND carbohydrates.
-Dan is confused about the reason you advise him that in fact a healthy diet includes fats. He tells you that all fats are bad fats. You correct him, telling him that lipids are essential for cells. Which of the following is NOT True of lipids?

A) Lipids are an essential component of the cytoplasmic membrane.
B) Cholesterol provides rigidity to eukaryote cell membranes.
C) Lipids are composed of identical subunits.
D) The most common simple lipids in nature are the triglycerides.
E) Oils contain unsaturated fatty acids.