Use reasoning to answer the following question. Which of these diseases cannot reproduce by itself?
Options:
- (A) fever
- (B) Leptospirosis
- (C) animals
- (D) influenza
- (E) bacteria
- (F) heat or cold
- (G) dangerous
- (H) anemia
Viruses cannot reproduce by themselves. Influenza is a disease caused by viruses. Influenza is a disease that cannot reproduce by itself.
So, the answer is (D).