This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Arterial Disorders, Subject name: Surgery
Which artery is involved in dysphagia lusoria 
Select and explain. 
A. Abnormal right subclavian artery, B. Abnormal right thyroid artery, C. Abnormal right internal carotid artery, D. Abnormal left subclavian artery
A: Abnormal right subclavian artery
Answer: A: Abnormal right subclavian artery 
Explanation: Ans. is 'a' i.e., Abnormal right subclavian artery Dysphagia Lusoria* 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 ligamentumarteriosum and the pulmonary artery or aortic arch.# An abnormal right subclavian artery.(Arterialusoria)# An abnormal innominate artery.* Diagnosis is made by a lipoidal swallow or by arteriography.