Q: How many layers does the pleura have?  

Answer: C

The pleura is a membrane that surrounds the lungs and lines the thoracic cavity. It is a double-layered membrane, consisting of an outer parietal layer and an inner visceral layer. The parietal pleura lines the inner surface of the thoracic cavity, while the visceral pleura covers the outer surface of the lungs. The two layers are separated by a thin layer of fluid called pleural fluid, which reduces friction and allows the lungs to expand and contract smoothly during breathing. Therefore, option C is the correct answer.

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