Step 1: Understanding the Concept:
Gastric acid secretion is regulated by several factors.
Some stimulate, others inhibit secretion.
Step 2: Key Formula or Approach:
No specific formula.
Need to know gastric acid regulation.
Step 3: Detailed Explanation:
Histamine, gastrin, and acetylcholine stimulate acid secretion.
Prostaglandin inhibits acid secretion.
Thus, prostaglandin is NOT a stimulatory factor.
Step 4: Final Answer:
Prostaglandin does NOT stimulate acid secretion.
Hence, the correct option is (D).