Indicate whether each of the following examples better applies to commensalism (C), mutualism (M), or parasitism (P) in the interaction between a host and a microbe. Your answer would be a four-letter string composed of letters C, M, and P only, e.g. CCPP.
( ) Due to poor public sanitation, a child catches cholera.
( ) A mouse is infected with a virus but shows no noticeable health defect whatsoever.
( ) Biotin and other vitamins produced by intestinal microbiota are regularly absorbed in the human intestine.
( ) Bacteria on the skin of cattle produce antifungal compounds.