Which one of the following compound is aromatic? 
Definitions:
Heartburn
A burning discomfort or pain in the chest, usually arising from the reflux of stomach acid into the esophagus.
Avoidance Learning
A process of operant conditioning where learning occurs through the avoidance of an unpleasant stimulus.
Classical Conditioning
The acquisition of knowledge that takes place by associating an external stimulus with a naturally existing stimulus, which triggers a deliberate response.
Operant Conditioning
A learning process in which the probability of a response is changed by its consequences, with behaviors being strengthened or weakened by reinforcements or punishments.
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