One of the following sentences is true about intestinal protozoa
A. C Internal autoinfection with cryptosporidiosis may be developed by thin wall sporulated oocyst
B. The diagnostic stage of Balantidium coli infection is only the cyst
C. Stage found in feces
D. The cervical swab is not a true method for the detection of Trichomonas vaginalis
E. The trophozoite stage only of Giardia lamblia can invade intestinal tissue and cause traveler diarrhea