I think it might be A but I'm not sure
Answer:
The immune response is how your body recognizes and defends itself against bacteria, viruses, and substances that appear foreign and harmful.
Information
The immune system protects the body from possibly harmful substances by recognizing and responding to antigens. Antigens are substances (usually proteins) on the surface of cells, viruses, fungi, or bacteria. Nonliving substances such as toxins, chemicals, drugs, and foreign particles (such as a splinter) can also be antigens. The immune system recognizes and destroys, or tries to destroy, substances that contain antigens.
Your body's cells have proteins that are antigens. These include a group of antigens called HLA antigens. Your immune system learns to see these antigens as normal and usually does not react against them.
Once you try a drug amd you like it you get hooked so alot of people are hooked on drugs
Environmental influence , health habits , disease are the most common and strongly influence length of life expectancy, quality of health and incidence of chronic illness. Tobacco,exposed to smoke , poor nutrition , including diets low in fruits and vegetables and high in sodium and saturated fats.
There are some factors of chronic disease which effect , the main modification behavioral risk factors are tobacco use, alcohol use, an healthful diet and physical inactivity.
The most common risks that associated with the deaths of both men and women are high body mass index , and high fasting plasma glucose but greater cumulative impact on health comes from poor diet.
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