Fact 1: Plasma cells are activated B cells that secrete antibodies.

Fact 2: Antibodies kill bacteria.

Given the two facts above, answer the question "What kills bacteria?" with the following options: 
- rays or beams
 - Plasma cells
 - Cooking
 - an electric stove
 - Petri dish
 - deal
 - phlange
 - evaporation


 

  Plasma cells       