A 62-year-old male presents with difficulty swallowing. Tests reveal a loss of esophageal peristalsis and failure of the lower esophageal sphincter to relax. Functional dysphasia is the diagnosis. A history of which of the following could be the most likely cause? (Select all that apply.)
a. Parkinson disease
b. Cerebrovascular accident
c. Achalasia
d. Peptic ulcer disease
e. Pyloric stenosis
Answer: A, B, C
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