This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
[{'content': '. Brocas aphasia is? \nSelect and explain. \nA. Fluent aphasia, B. Non fluent aphasia, C. Sensory aphasia, D. Conduction aphasia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: *Speech output is sparse (nonfluent), slow, labored, interrupted by many word- finding pauses, and usually dysahric; output may be reduced to a grunt or single word. Ref Harrison20th edition pg 2678', 'role': 'assistant'}]