This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
[{'content': 'Feline esophagus is: \nSelect and explain. \nA. Eosinophilic esophagitis, B. GERD, C. Radiation esophagitis, D. Carcinoma esophagus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref. API Textbook of Medicine. Pg. 1690\n\xa0\nFeline Esophagus\n\nFeline esophagus also known as oesophageal shiver ,refers to the transient transverse bands seen in the mid\xa0 and lower esophagus on a double contrast barium swallow .\nThe appearance is almost always associated with active gastro-esophageal reflux and is thought to be due to contraction of muscularis muosa with resultant shortening of the esophagus and "bunching up" of mucosa in the lumen .', 'role': 'assistant'}]