Q: I am verifying the answers generated by an automatic system to the following question: how many classes of vitamins Suggested answer: However, vitamins have been produced as commodity chemicals and made widely available as inexpensive semisynthetic and synthetic-source multivitamin dietary and food supplements and additives, since the middle of the 20th century. Should I validate this answer?

Pick your answer from: A. No; B. Yes;
A:
A.