**Core Concept**
Surgical stress triggers a complex neuroendocrine response, involving the release of various hormones to maintain homeostasis. This response is mediated by the **hypothalamic-pituitary-adrenal (HPA) axis** and the **sympathetic nervous system**. The hormonal response helps the body to adapt to the stress induced by surgery.

**Why the Correct Answer is Right**
Although the question is incomplete, typically in surgical stress, hormones like **cortisol**, **aldosterone**, **adrenaline**, and **noradrenaline** are increased. However, one hormone that is often decreased in response to surgical stress is **insulin**, due to the body's prioritization of glucose mobilization over storage, and another is **testosterone**, but most notably, **thyroid-stimulating hormone (TSH)** and consequently **thyroid hormones** can be affected, yet the most direct decrease is often seen in **insulin** levels due to increased **glucagon** and **corticosteroids** which counteract insulin's effects.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific hormone listed, it's challenging to provide a precise explanation, but generally, most hormones involved in the stress response are elevated.
**Option B:** Similarly, without the specific details, it's hard to address, but typically, hormones like **adrenaline** are increased.
**Option C:** Again, lacking specifics, but **cortisol** levels are known to increase in response to surgical stress.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that surgical stress induces a catabolic state, where the body breaks down tissues to provide energy, and understanding which hormones are increased or decreased can help in managing post-surgical patients, particularly in terms of glucose control and hormonal replacement therapy if necessary.

**Correct Answer:** D. Insulin