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Several immune system functions are dependent on sufficient vitamin A, which is why it is known as an important immune booting vitamin. Genes involved in immune responses are regulated by Vitamin A
One of the most important roles of vitamin D is to maintain skeletal calcium balance by promoting calcium absorption in the intestines
Calcium is a mineral that helps bones stay strong. Our bodies continually remove small amounts of calcium from our bones and replace it with new calcium, a bone "remodeling" process
Answer : (c)