People suffering from pernicious anemia should:
A. be given an injection of about 100 mcg of cobalamin every month.
B. be given 500 mcg of cobalamin intravenously once a month.
C. be given 1 mcg of cobalamin orally every day.
D. be given 100 mcg of cobalamin intravenously on a daily basis.
Answer: A
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