This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
[{'content': 'pt. with acute onset of left side weakness and loss of sensation over left side of body with facial sparing. on protrusion of tongue , detes to the right side which aery involved ? \nSelect and explain. \nA. PICA, B. VEEBRAL AERY, C. CAROTID AERY, D. AICA', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Posterior inferior cerebellar aery syndrome results from a vascular event in the lateral pa of the medulla oblongata. It was seen to be more frequently related to cardiogenic embolism as compared to other causes. REF : HARRISONS 21ST ED', 'role': 'assistant'}]