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
Lesion in inferior frontal gyrus causes: 
Select and explain. 
A. Defect in aiculation, B. Incomprehension of written language, C. Incomprehension of spoken language, D. Motor aphasia
D: Motor aphasia
Answer: D: Motor aphasia 
Explanation: Answer is D (Motor aphasia):