You Suspect That Your Brother Has Giardiasis, Caused by Giardia

You suspect that your brother has giardiasis, caused by Giardia lamblia. Which of the following is NOT true about this disease?

A) The cysts of G. lamblia are are resistant to stomach acid and are infectious.
B) A person with giardiasis diarrhea is likely to eliminate G. lamblia cysts rather than trophozoites.
C) The causative organism has energy-metabolizing organelles called mitosomes.
D) Giardiasis is a zoonotic disease.
E) Chlorinated water may still contain G. lamblia because the cysts are resistant to this chemical.