Analyze the structure of prostaglandin E2. What is the significance of its cyclopentane ring?

• A. It allows prostaglandin E2 to dissolve in water.
• B. It is responsible for the molecule's color.
• C. It is derived from arachidonic acid and is essential for its function.
• D. It prevents prostaglandin E2 from interacting with other molecules.

Answer: (C)