Which of the following is one of the four basic tissues that make up the body's organs?

• A. Epithelial
• B. Blood
• C. Bone
• D. Cartilage

Answer: (A)

Understanding the four basic tissue types that form organs helps explain why epithelial tissue is the correct choice. Epithelial tissue covers surfaces, lines cavities and organs, and forms glands. It acts as a protective barrier and is involved in absorption, filtration, and secretion—functions essential to organ structure and function. The other options are all connective tissues—blood, bone, and cartilage—each serving support, connection, or transport roles rather than being one of the four fundamental tissue categories. Blood is a fluid connective tissue, while bone and cartilage provide structural support and cushioning. So, epithelial tissue fits as one of the four basic tissue types.