Quiz: Effects of Aging on the Immune System
Question 1 of 2  

As people age, the immune system becomes less effective in which of the following ways? 

  • A.

    Is less able to identify foreign substances in the body

  • B.

    Is effective in fighting cancer

  • C.

    Is able to respond quickly to foreign substances

  • D.

    Causes vaccines to be more effective

Am I correct?