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
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 ? 
Select and explain. 
A. PICA, B. VEEBRAL AERY, C. CAROTID AERY, D. AICA
A: PICA
Answer: A: PICA 
Explanation: 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