Prostaglandins are
(a) Simple proteins
(b) Conjugated proteins
(c) Saturated fatty acids
(d) Unsaturated fatty acids

Options

A. Simple proteins
B. Conjugated proteins
C. Saturated fatty acids
D. Unsaturated fatty acids.

Answer

To determine what prostaglandins are, let's analyze the options provided in the question step by step.

### Step 1: Understand Prostaglandins
Prostaglandins are a group of lipid compounds that are derived from fatty acids. They play various roles in the body, including mediating inflammation and other physiological functions.

### Step 2: Identify the Source of Prostaglandins
Prostaglandins are synthesized from arachidonic acid, which is a type of fatty acid. Arachidonic acid is known to be a polyunsaturated fatty acid, specifically an omega-6 fatty acid.

### Step 3: Analyze the Options
Now, let’s evaluate the options given in the question:
- **(a) Simple proteins**: Prostaglandins are not proteins; they are lipid molecules.
- **(b) Conjugated proteins**: Again, prostaglandins are not proteins, so this option is incorrect.
- **(c) Saturated fatty acids**: Arachidonic acid, the precursor of prostaglandins, is unsaturated, so this option is also incorrect.
- **(d) Unsaturated fatty acids**: Since prostaglandins are derived from arachidonic acid, which is an unsaturated fatty acid, this option is correct.

### Step 4: Conclusion
Based on the analysis, the correct answer is:
**(d) Unsaturated fatty acids.**