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: Medicine
Intermittent dysphagia is caused by 
Select and explain. 
A. Stricture, B. Achalasia cardia, C. Pharyngeal diveiculum, D. All
C: Pharyngeal diveiculum
Answer: C: Pharyngeal diveiculum 
Explanation: Answer is C (Pharyngeal diveiculum) Progressive Achalasia Progressive systemic sclerosis Peptic stricture Carcinoma Intermittent Lower esophageal ring/Spatzki ring Diffuse esophageal spasm Zenker's diveiculum