Provide the structures of A, B and C for the following reaction sequence. 
Definitions:
Masters and Johnson
A research team known for their work in the field of human sexuality, studying the sexual response cycle and sexual disorders.
Sexual Response Cycle
The four stages of sexual responding described by Masters and Johnson—excitement, plateau, orgasm, and resolution.
Refractory Period
The period immediately following a stimulus during which a nerve or muscle is unresponsive to further stimulation.
Physiological Arousal
Refers to the body's physical response to stimuli, which can include increased heart rate, sweating, or rapid breathing.
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