This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Peptic Ulcer Disease, Subject name: Medicine
Investigation of choice for dysphagia lusoria is? 
Select and explain. 
A. Barium studies, B. X-ray, C. CT angiography, D. Esophageal manometry
C: CT angiography
Answer: C: CT angiography 
Explanation: Dysphagia lusoria Compression of the oesophagus by the aberrant right subclan aery * Barium study of the esophagus may show the indentation on the posterior esophageal wall by the aery. * Chest x-ray can demonstrate enlargement of the superior mediastinum. * CT angiography and MRI thorax are the best diagnostic modalities that could identify the dysphagia lusoria. * In children, the most common presentations are stridor and recurrent chest infections, may be due to their tracheal softening comparing to adult population.