Which of the following is NOT true regarding ventilation-perfusion inequality?
A. It is increased from normal in patients with emphysema.
B. It is caused by too little or too much blood flow relative to ventilation.
C. No inequality exists in normal lungs.
D. It may result from increased alveolar dead space.
E. It is caused by too little or too much ventilation relative to blood flow.
Answer: C
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Fill in the blank(s) with the appropriate word(s).