This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oesophagus, Subject name: Surgery
A patient complains of intermittent dysphagia, which is equal for both solids and liquids, which is the most common cause: 
Select and explain. 
A. Achalasia, B. Esophageal Stricture, C. DES, D. Carcinoma
C: DES
Answer: C: DES 
Explanation: Ans. (c) DESRef: Bailey and Love 27h edition, Page 1099Diffuse Esophageal Spasm:* Intermittent dysphagia with chest pain is a symptom of Diffuse Esophageal spasm.* Slow progressive dysphagia is seen in achalasia for both solids and liquids but more for liquids.Other causes of intermittent dysphagia:* Zenker diverticulum* Schatzki ring* Esophagitis