The correct answer is B. Pleura.
The pleura is a thin, serous membrane that surrounds the lungs and lines the inside of the chest cavity. It helps to protect the lungs and keep them in place. The pleura is made up of two layers: the visceral pleura, which covers the lungs, and the parietal pleura, which lines the chest cavity. The two layers of pleura are separated by a thin layer of fluid, which helps to reduce friction as the lungs move during breathing.
The dura mater is the outermost layer of the meninges, which are the membranes that surround the brain and spinal cord. The pia mater is the innermost layer of the meninges. The myelin sheath is a layer of fatty tissue that insulates nerve fibers.
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