Question

Substances that are produced by the body to fight against the invader is:

• A. Antibiotic
• B. Vaccine
• C. Antibody
• D. Antigen

Answer 1

The correct option is C

Antibody

The correct option is (C):

Explanation of the correct option:

1. The protein molecules that are produced by immune cells which act against the antigens or invaders are called antibodies.
2. Antibodies are highly specific for the type of antigen or pathogen and it binds with the antigen to control its effect in the individual.

Explanation of the incorrect options:

Option (A):

1. Antibiotics are chemical molecules secreted by bacteria and fungi that can kill the bacteria or control its growth.
2. Antibiotics are used as medication for controlling bacterial infections, but it is not produced in humans.

Option (B):

1. Vaccine is prepared using weakened or dead microbes that are unable to infect the individuals.
2. Vaccines can induce the immune functions in the body by producing antibodies that can act against any future infection by the same pathogen.

Option (D):

The foreign invaders like the pathogens that can infect an individual are called antigens and they can induce an immune response to protect the individual.

Final Answer: Substances that are produced by the body to fight against the invader are antibodies.