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B
Wall of gut
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C
Uterus
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D
Wall of blodd vessels
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Solution
The correct option is A Body cavity A. Body cavity
EXPLANATION: Mesothelium is a membrane, which is made up of simple squamous epithelium. It forms the lining of several body cavities, like pleura (thoracic cavity), peritoneum (abdominal cavity), pericardium (heart sac).