Sandy Has Been Taking an Antibiotic for a Urinary Tract

Sandy has been taking an antibiotic for a urinary tract infection (UTI) . Although the signs and symptoms of Sandy's UTI resolved after a few days of taking the medication, she complains to you that she has been having watery diarrhea for the last two days, and she wonders whether the antibiotic is affecting her digestive tract. You take the opportunity to give her information about her normal microbiota.
-You explain to Sandy that her body carries an enormous population of microorganisms, collectively called the normal microbiota. You tell her that this population has a vital role in maintaining her health. Select the False statement regarding the role of the normal microbiota.

A) Normal microbiota prevent disease by competing with pathogenic microbes.
B) Normal microbiota help to degrade foods that the body otherwise could not digest.
C) Normal microbiota synthesize vitamins that the body cannot produce.
D) Normal microbiota produce insulin for controlling blood sugar levels.
E) Normal microbiota likely affects the tendency to lose or gain weight.