Which of the following reagents is used in the following reaction? 
Definitions:
Prolonged Stress
Continuous stress exposure over an extended period, leading to negative health outcomes such as chronic anxiety, depression, or physical illness.
Immune System
The complex network of cells, tissues, organs, and the substances they produce that helps the body defend against infections and other diseases.
Middle Adulthood
A developmental stage, typically considered to occur from approximately 40 to 65 years of age, characterized by increased personal, social, and career responsibilities.
Creativity
The ability to produce original and valuable ideas, involves thinking or producing in ways that diverge from standard or traditional methods.
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