Question

Antigen is a substance, which
A. Lowers the body temperature
B. Destroy Harmful bacteria
C. Triggers the immune system
D. Is used as an antidote to poison

Answer 1

Immunology is an area of biology that focuses on the human immune system, including the different types of immune systems, their functioning, and how our bodies protect ourselves from infectious diseases caused by microbes and infectious agents. Immunity can be divided into two categories: Innate immunity is passed down from parents to their children and protects them from birth till death. Acquired immunity is also known as adaptive immunity because it is acquired after birth by vaccination, antibiotics, immunisation, and other methods. Antigens are substances that cause an immunological reaction, causing antibodies to be produced.

Complete answer:
Option A: Antigens are substances that prompt the immune system to produce antibodies against them because the immune system perceives them as a threat.
So, option A is incorrect.
Option B: Antigens are substances that stimulate the immune system to create antibodies in response to them because they are perceived as a threat by the immune system.
So, option B is incorrect.
Option C: Antigens are substances that stimulate the immune system to create antibodies against them because they are perceived as a threat by the immune system.
So, option C is correct.
Option D: An immune response is generally triggered when antigens are present in the body. Antibodies are antibodies that "target" antigens. After cells in the immune system come into contact with an antigen, the immune system produces a specific antibody to match it, allowing for precise antigen recognition and the activation of an adaptive response.
So, option D is incorrect.

Therefore, Option C is the correct answer.

Note:
An antigen is a substance that generates an immunological response by triggering the creation of antibodies. Antigens are big protein molecules found on the pathogen's surface, such as bacteria, fungi, viruses, and other foreign particles. When these toxic substances enter the body, they trigger an immunological response that causes antibodies to be produced. Immunity refers to the body's ability to fight disease-causing substances and antigens through the immune system. Immunity can be inherited or acquired through immunizations.