What kind of epidemiological study is the following example? "A study that evaluates two treatments for ovarian cancer. Women with stage 1 ovarian cancer are randomized to receive either oophorectomy alone or oophorectomy with radiation. Women are followed for 5 years to determine if there are any differences in ovarian cancer recurrence and survival."

Ineed to get this test done which of the following statements is correct in hour our immune system responds to a potential pathogen? a.) the skin will be the first line of defense, and then the many phagocytes in the bloodstream will attempt to consume the possible pathogen. b.) b cells will start reading the antigen code immediately and call t cells to assist in destroying the pathogen. c.) the adapted immune system will call on the innate immune system to destroy the pathogen. d.) the t-cells in the adapted immune systems are the first to recognize the pathogen