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 diagnosed by 
Select and explain. 
A. Barium swallow, B. Endoscopy, C. CT angiography, D. PET CT
C: CT angiography
Answer: C: CT angiography 
Explanation: It is aberrant right subclavian artery pressing on the oesophagus causing dysphagia. Diagnosed by CT angiography.