Here is a single or multi-choice question: What nutrients are for healthy bones and teeth ?

Would the answer to this question be an entity, an abbreviation, a description, a human, a location, or a numeric value?

Choices:
 (A). description;
 (B). entity;
 (C). abbreviation;
 (D). human;
 (E). numeric;
 (F). location;
(B).