Let's think step by step! Many _ can cause the immune system to not work properly.
Options:
- (A) fever
- (B) bacteria
- (C) radiation
- (D) fungi
- (E) A drug.
- (F) Allergies
- (G) cancers
- (H) Toxicity
The thinking starts now:
Immunodeficiency occurs when the immune system is not working properly. Many cancers can cause immunodeficiency. Many cancers can cause the immune system to not work properly. The final answer: (G).