Given below are two statements, one is labelled as Assertion (A) and the other is Reason (R): Assertion (A): The human body synthesises all the vitamins required by it. Reason (R): Vitamins are essential for the proper growth of the body. Select the correct option from the codes given below.

Why does the requirement for iron increase significantly during pregnancy?

Which of the following statements are correct regarding the specific physiological roles of dietary minerals in regulating blood pressure? A. Sodium causes water retention, which leads to an increase in blood pressure. B. Potassium helps counteract the effects of sodium and relaxes blood vessels. C. Calcium's specific physiological role is aiding in vasodilation. D. Magnesium helps in vasodilation, which is the relaxation of blood vessels. Choose the most appropriate answer from the options given below: