What is required to activate a cytotoxic t cell


Problem:

Question: What is required to activate a Cytotoxic T cell?

  1. A known antigen bound to MHC-I
  2. A Helper T cell bound to an antigen and MHC-II and macrophage
  3. Any antigen on an MHC-II, whether new to the body or not
  4. An antigen that has been encountered previously

Please select correct answer and also provide explaination.

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Biology: What is required to activate a cytotoxic t cell
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