In this task, you need to write a topic word from the given fact. The topic word must have at least one word overlap with the given fact. The topic word often involves adding a new word from a related concept. In your topic word, use at least one word from the given fact. Topic words with two or more words work best.

[Q]: Fact: Passive immunity lasts only as long as the antibodies survive in body fluids.
[A]: antibodies protein.


[Q]: Fact: Plasma cells are activated B cells that secrete antibodies.
[A]: antibodies fight infection.


[Q]: Fact: Cytoplasm refers to all of the cellular material inside the plasma membrane.
[A]:
a membrane is.