Q: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Question: Strict vegetarians with low sun exposure should consume foods rich in vitamin:
Options: <1> Retinol (A). <2> Ascorbic acid (C). <3> Calciferol (D). <4> Riboflavin (B2). <5> Niacin (B3).
A:
3