This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'Lesion in inferior frontal gyrus causes: \nSelect and explain. \nA. Defect in aiculation, B. Incomprehension of written language, C. Incomprehension of spoken language, D. Motor aphasia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Answer is D (Motor aphasia):', 'role': 'assistant'}]