You are presented with the question "What can make passive immunity last?" and the following answer choices: 
- resistance
 - sweating
 - Leptospirosis
 - breast milk
 - smoking tobacco
 - the environment
 - competition
 - fur seals

Now knowing that passive immunity lasts only as long as the antibodies survive in body fluids and breast Milk contains antibodies, choose the best answer.


 

    breast milk     