The correct answer is d. it is mainly there to prevent any noxious substance from inner into the gut.
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An omentum is a layer of the peritoneum (the serous membrane that lines abdominal cavity) that surrounds abdominal organs. It is known that omentum plays a role in immune responses. Omentum contains the clusters of white blood cells (lymphocytes), called “milky spots” which have the first-line defence role in the immune system. When a noxious substance is present, the "milky spots" induce the release of inflammatory molecules.</span>
Any occurence of extra chromosones is due to genetic mutation/disorders.
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The answer is going to be C