Correct Answer: weakened germs

Solution : The correct option is weakened germs.

The vaccination against smallpox contains a weakened form of the smallpox virus. The weakened virus is not able to cause the disease, but it can still trigger the immune system to produce antibodies against the virus. The virus then enters the body and travels to the lymph nodes, where it begins to multiply. The immune system then recognizes the virus and produces antibodies against it. The antibodies will stay in the body for a long time, protecting against the smallpox virus. If the individual is later exposed to the smallpox virus, the antibodies will attach against it and prevent it from invading the cells. This will help to keep the person from becoming sick.