Where do certain symbiotic micro-organisms normally occur in human body?

Options

(a) Caecum
(b) Oral lining and tongue surface
(c) Vermiform appendix and rectum
(d) Duodenum

Correct Answer:

Caecum

Explanation:

The caecum is a pouch-like portion of the large intestine which hosts some symbiotic micro-organisms. The caecum absorbs water and salts from undigested food before they continue on to the large intestine.