Fact 1: Roundworms may be free-living or parasitic.

Fact 2: Roundworms Can Cause Anorexia.

Given the two facts above, answer the question "Anorexia can be caused by " with the following options: 
- parasites
 - contamination
 - cigarettes
 - Leptospirosis
 - Smoking
 - Pesticides
 - heat or cold
 - acetic acid


 

 parasites        