While Web MD is a website that provides a lot of useful information, it is not a peer reviewed/scholarly source. If your instructor requires scholarly sources, I would recommend that you specifically search one of the library's websites for information from one of the databases. These can be found at http://library.tctc.edu/ . You can either select the link for All-Discipline Databases or Specialized Databases which will lead you to links to pages like Health and Medicine.
