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B
Submucosa
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C
Serosa
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D
Muscularis
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E
Pleura
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Solution
The correct option is B Mucosa The mucosa, or mucous membrane layer, is the innermost tunic of the wall. It lines the lumen of the digestive tract. The mucosa consists of epithelium, an underlying loose connective tissue layer called lamina propria, and a thin layer of smooth muscle called the muscularis mucosa.