## **Core Concept**
The body's response to stress involves the activation of various hormonal pathways. The primary stress response involves the hypothalamic-pituitary-adrenal (HPA) axis, leading to the release of **cortisol**, **adrenaline** (epinephrine), and other hormones. During stress, the body also experiences changes in the levels of various hormones to help manage the stressor.

## **Why the Correct Answer is Right**
The correct answer, **insulin**, is not increased during stress. In fact, stress leads to a decrease in insulin secretion and an increase in **glucagon** and **catecholamines** (like adrenaline), which work to increase blood glucose levels. This response helps provide energy to the brain and muscles to deal with the stress. Insulin, which lowers blood glucose by facilitating glucose uptake into cells, would counteract this stress response.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While not explicitly listed, typically, **cortisol** levels increase during stress. Cortisol helps mobilize energy stores and is a key component of the HPA axis response to stress.
- **Option B:** **Adrenaline (epinephrine)** levels increase during stress. It prepares the body for 'fight or flight' by increasing heart rate, blood pressure, and energy supplies.
- **Option C:** **Glucagon** levels increase during stress. Glucagon works to increase blood glucose levels by stimulating glycogenolysis and gluconeogenesis, providing more glucose for energy.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that stress induces a **catabolic state**, characterized by increased levels of cortisol, glucagon, and catecholamines, which help mobilize energy stores. Insulin levels are relatively decreased in this state to allow glucose levels to rise. This response is crucial for immediate survival but can have negative effects if chronically activated.

## **Correct Answer:** . Insulin