## Core Concept
The question tests knowledge of medications that can induce diabetes mellitus, a condition characterized by hyperglycemia due to impaired insulin secretion, insulin resistance, or both. Certain drugs can precipitate or worsen diabetes through various mechanisms.

## Why the Correct Answer is Right
Thiazide diuretics are not commonly associated with inducing diabetes mellitus compared to the other options. Thiazides can cause hyperglycemia but are less likely to induce diabetes compared to glucocorticoids, certain psychiatric medications, and some immunosuppressants.

## Why Each Wrong Option is Incorrect
* **Option A:** Glucocorticoids are well-known to induce hyperglycemia and diabetes mellitus by promoting gluconeogenesis, lipolysis, and insulin resistance.
* **Option B:** Certain psychiatric medications, especially atypical antipsychotics, can increase the risk of developing diabetes mellitus through mechanisms that include weight gain and direct effects on insulin sensitivity.
* **Option D:** Immunosuppressants like cyclosporine and tacrolimus can induce diabetes mellitus by causing insulin resistance and possibly damaging pancreatic beta cells.

## Clinical Pearl / High-Yield Fact
A key point to remember is that while many drugs can contribute to hyperglycemia, the risk of actually inducing diabetes mellitus varies. Glucocorticoids, for instance, are a classic cause, especially with prolonged use.

## Correct Answer: B.