Consider five high school students working on homework in study hall. 
Which of the following pairs of students has a double coincidence of wants?
Definitions:
Psychotherapy
A treatment approach utilizing psychological techniques, primarily through consistent personal engagement with adults, aimed at facilitating behavioral change and resolving issues effectively.
Hippocampus
A brain structure located below the cerebral cortex that is involved in memory.
Gray Matter
The darker tissue of the brain and spinal cord, consisting mainly of nerve cell bodies and branching dendrites, involved in muscle control and sensory perception.
Lithium
A chemical element used as a medication to treat and prevent episodes of mania in people with bipolar disorder.
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