This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cranial Nerves, Subject name: Anatomy
[{'content': 'Palsy of right genioglossus causes \nSelect and explain. \nA. Detion of tongue to right, B. Detion of tongue to left, C. Detion of soft palate to right, D. Detion of soft palate to left', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Palsy of right genioglossus muscle detes the tongue to the right side, due to unopposed medial pull of the left genioglossus. Genioglossus muscle moves the tongue anterior (protrusion), inferior (depression) and medial (AIM). In bilateral contraction of genioglossus, the vector of medial pull is balanced (and cancelled), and there occurs protrusion and depression of tongue in midline.', 'role': 'assistant'}]