What would be the reactant in the following reaction sequence? 
Definitions:
Stressors
External factors or stimuli that cause stress to an individual.
Type A Behaviour Pattern
A personality pattern that includes aggressiveness, ambitiousness, competitiveness, hostility, impatience, and a sense of time urgency.
Physiological Reactions
Bodily responses to various stimuli, including changes in heart rate, hormone levels, or muscle tension, among others.
Adverse
Referring to conditions or situations that are unfavorable or harmful, potentially leading to negative outcomes.
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