phagocytes B lymphocytes helper T lymphocytes cytotoxic T lymphocytes
I gave my students this multiple choice question: When a person is infected with the influenza virus, the immune system defends the body through a cell-mediated immune response. Which immune cell is responsible for protecting the body from the influenza virus infection?

Only one answer is correct among these 4 choices:
- phagocytes
- B lymphocytes
- helper T lymphocytes
- cytotoxic T lymphocytes

Could you tell me which one is correct?

cytotoxic T lymphocytes