**Core Concept**
Inhibitors of prostaglandin synthesis, such as nonsteroidal anti-inflammatory drugs (NSAIDs), act by blocking the enzyme **cyclooxygenase (COX)**, which is crucial for the production of prostaglandins from arachidonic acid. Prostaglandins play significant roles in mediating inflammation, pain, and fever.

**Why the Correct Answer is Right**
Since the correct answer is not provided, let's discuss the general effects of inhibitors of prostaglandin synthesis. These inhibitors reduce inflammation, alleviate pain, and decrease fever by reducing the levels of prostaglandins. They also have effects on the gastrointestinal system and kidney function due to the role of prostaglandins in these systems.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific details of option A, we cannot directly address why it is incorrect. However, typically, options that are incorrect regarding inhibitors of prostaglandin synthesis might involve effects that are opposite of what these inhibitors cause, such as increased inflammation or enhanced gastrointestinal bleeding (though the latter can be a side effect, it's not a direct therapeutic effect).
**Option B:** Similarly, without specifics, we can't directly refute option B. Generally, incorrect options might include effects that are not directly related to the inhibition of prostaglandin synthesis, such as significant impacts on the central nervous system beyond pain relief.
**Option C:** Again, lacking specifics, we can say that an incorrect option might involve effects that are not typical of prostaglandin synthesis inhibitors, such as immunosuppression or significant effects on blood pressure regulation (though prostaglandins can influence blood pressure, inhibitors' effects are more nuanced).
**Option D:** Without details, we can speculate that an incorrect option might involve therapeutic effects that are not primarily associated with the inhibition of prostaglandin synthesis.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that while inhibitors of prostaglandin synthesis are effective for their intended purposes, they can have notable side effects, such as gastrointestinal irritation and potential kidney damage, due to the reduction of protective prostaglandins in these systems.

**Correct Answer:** Correct Answer: D. Increased gastric acid secretion