Step 1: Understanding the Concept.
Tumour names generally reveal which tissue they started in. Learning the two main root words used in cancer naming makes it easy to place any tumour into the right category.
Step 2: Key Approach.
Remember the split: "carcinoma" comes from epithelial tissue (skin, glands, linings), while "sarcoma" comes from mesenchymal or connective tissue (bone, cartilage, muscle, fat, blood vessels).
Step 3: Detailed Explanation.
Glands and epithelium are both epithelial in origin, so cancers there are called adenocarcinoma or carcinoma, not sarcoma.
Plasma cell cancer has its own name, myeloma, because plasma cells are a specialised blood cell line rather than connective or epithelial tissue.
Connective tissue includes bone, cartilage, fat, and fibrous tissue, all of which develop from mesenchymal cells, and cancers arising there carry the suffix "sarcoma", for example osteosarcoma for bone.
This makes connective tissue the only option that lines up with the meaning of the word sarcoma.
Step 4: Final Answer.
Sarcoma is the cancer of connective tissues.