Embryonic germ layer forming the gut lining.

Embryonic germ layer forming the gut lining.

• A. Endocarditis
• B. Endomysium
• C. Endoderm
• D. Endocrine

Answer: (C)

The gut lining comes from the endoderm. During early development, the embryo forms three germ layers, and the endoderm becomes the mucosal epithelium lining the digestive and respiratory tracts, as well as many associated organs like the liver and pancreas. That’s why endoderm is the correct choice. The other terms refer to different things—endocarditis is inflammation of the heart’s inner lining, endomysium is the connective tissue around muscle fibers, and endocrine relates to hormone-secreting glands, not germ layer origin.

The gut lining comes from the endoderm. During early development, the embryo forms three germ layers, and the endoderm becomes the mucosal epithelium lining the digestive and respiratory tracts, as well as many associated organs like the liver and pancreas. That’s why endoderm is the correct choice. The other terms refer to different things—endocarditis is inflammation of the heart’s inner lining, endomysium is the connective tissue around muscle fibers, and endocrine relates to hormone-secreting glands, not germ layer origin.