Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Colorectal Cancer ?
    ### Response:
    Here are some of the tools used to detect colorectal cancer. - A fecal occult blood test, or FOBT, is a test used to check for hidden blood in the stool. Sometimes cancers or polyps can bleed, and FOBT can detect small amounts of bleeding. Newer, genetically-based stool tests are proving to be more accurate than older tests.
    