Prostaglandins are local regulators whose chemical structure is derived from:

• A. Oligosaccharides.
• B. Fatty Acids.
• C. Steroids.
• D. Amino Acids.
• E. Isoprenoids.

Answer: (B)

Verified step by step guidance

1. Understand the role of prostaglandins: Prostaglandins are a group of physiologically active lipid compounds having diverse hormone-like effects in animals.
2. Identify the chemical nature of prostaglandins: They are derived from fatty acids, specifically arachidonic acid, which is a 20-carbon polyunsaturated fatty acid.
3. Recognize the biosynthetic pathway: Prostaglandins are synthesized from arachidonic acid through the cyclooxygenase (COX) pathway, which involves the conversion of arachidonic acid into prostaglandin H2, a precursor for other prostaglandins.
4. Differentiate from other options: Oligosaccharides, steroids, amino acids, and isoprenoids are not the precursors for prostaglandins. Oligosaccharides are carbohydrates, steroids are a class of lipids with a different structure, amino acids are the building blocks of proteins, and isoprenoids are derived from isoprene units.
5. Conclude with the correct answer: Based on the chemical structure and biosynthetic pathway, prostaglandins are derived from fatty acids.