Long-term antibiotic use may be associated with vitamin K deficiency because antibiotics
a. prevent absorption of vitamin K.
b. kill gut bacteria that synthesize vitamin K.
c. break down dietary vitamin K in the intes-tines.
d. impair blood clotting and increase vitamin K requirements.
B
Antibiotics kill gut bacteria that synthesize vitamin K, so long-term use of antibiotics may cause vitamin K deficiency. Antibiotics do not interfere with vitamin K absorption, break down dietary vitamin K in the intestines, impair blood clotting, or increase vitamin K requirements.
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