Immunodeficiency occurs when the immune system is not working properly.
Malnutrition , particularly with lack of protein , can cause acquired immunodeficiency.
Something caused by malnutrition occurs when the immune system is not working properly.
What can cause the immune system to not work properly?
Options:
  - cigarettes
  - Malnutrition
  - burning coal
  - Healthy food
  - Exercise
  - Good health
  - Allergies
  - Pesticides