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
Motor aphasia refers to defect in: 
Select and explain. 
A. Peripheral speech apparatus, B. Verbal expression, C. Auditory comprehension, D. Verbal comprehension
B: Verbal expression
Answer: B: Verbal expression 
Explanation: Answer is B (Verbal expression): Motor aphasia also known as expressive aphasia is a disorder of thought and word finding resulting in inadequate verbal expression. * Defect in hearing: Deafness * Defect in understanding: Receptive aphasia / Sensory aphasia * Defect in thought and word finding: Motor / Expressive aphasia * Defect in voice production: Dysphonia * Defect in aiculation: Dysahric