Fact 1: Passive immunity lasts only as long as the antibodies survive in body fluids.

Fact 2: Breast Milk contains antibodies.

Given the two facts above, answer the question "What can make passive immunity last?" with the following options: 
- resistance
 - sweating
 - Leptospirosis
 - breast milk
 - smoking tobacco
 - the environment
 - competition
 - fur seals


 

    breast milk     