A patient is admitted with chest pain. After a full workup, myocardial infarction is ruled out, and the physician determines the cause of the chest pain to be gastroesophageal reflux disease (GERD). According to UHDDS guidelines, what is the principal diagnosis?
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A
Acute myocardial infarction
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B
Chest pain
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C
Gastroesophageal reflux disease (GERD)
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D
Unspecified cardiac condition