Which of the following phenomena is shown in the figure below? 
Definitions:
Half-moon
A crescent-shaped figure, often used to describe the visible white shape at the base of a human fingernail.
Erectile Tissue
Tissue in the body capable of becoming rigid and engorged with blood, primarily found in the penis and clitoris.
Clitoris
An erectile organ located at the anterior junction of the labia minora.
Labia
The external folds of skin surrounding the openings of the vagina, divided into the labia majora and the labia minora.
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