What is the missing reagent in the reaction below? 
Definitions:
Congruency
In Carl Rogers's humanistic psychology, it refers to the alignment or consistency between an individual's self-concept and their experiences in reality.
Rogers's Concept
A psychological approach developed by Carl Rogers, centered on the idea of self-actualization and the importance of unconditional positive regard, empathy, and genuine interactions in personal development.
Existential Analytic Theory
A branch of psychology and psychotherapy that focuses on exploring the existential and philosophical dimensions of human experience, emphasizing autonomy, freedom, and the search for meaning.
Human Dilemma
A term that refers to the inherent challenges and existential conflicts faced by humans, such as the search for meaning and the inevitability of death.
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