**Core Concept**
Surgical stress triggers the release of various cytokines and hormones, leading to a systemic inflammatory response. This response is mediated by the hypothalamic-pituitary-adrenal (HPA) axis and the sympathetic nervous system.

**Why the Correct Answer is Right**
During surgical stress, cortisol levels increase due to the activation of the HPA axis. Cortisol plays a crucial role in suppressing the immune response and maintaining homeostasis. The release of cortisol is mediated by the pituitary gland's release of adrenocorticotropic hormone (ACTH), which stimulates the adrenal glands to produce cortisol. Additionally, the release of catecholamines, such as epinephrine and norepinephrine, also increases in response to surgical stress.

**Why Each Wrong Option is Incorrect**
* **Option A:** Catecholamines, such as epinephrine and norepinephrine, are released in response to surgical stress, making this option incorrect.
* **Option B:** Cortisol levels increase in response to surgical stress, making this option incorrect.
* **Option D:** Prostaglandins, such as prostaglandin E2 (PGE2), are released in response to surgical stress, making this option incorrect.

**Clinical Pearl / High-Yield Fact**
During surgical stress, the body's "fight or flight" response is activated, leading to the release of various hormones and cytokines. This response is mediated by the HPA axis and the sympathetic nervous system.

**Correct Answer:** A. Catecholamines (such as epinephrine and norepinephrine) are actually increased in surgical stress, not decreased.