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: Surgery
Dysphagia lusoria is due to - 
Select and explain. 
A. Oesophageal diverticulum, B. Aneurysm of aorta, C. Oesophageal web, D. Compression by aberrant blood vessel.
D: Compression by aberrant blood vessel.
Answer: D: Compression by aberrant blood vessel. 
Explanation: Dysphagia Lusoria is a disorder of swallowing caused due to vascular anomalies

Causes of Dysphagia Lusoria 

A right aortic arch
A double aortic arch
A vascular constricting ring formed by a PDA or a ligamentum arteriosum and the pulmonary artery or aortic arch.
An abnormal right subclavian artery. (Arteria lusoria)
An abnormal innominate artery.
Diagnosis is made by a lipoidal swallow or by arteriography.