The answer is D
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Menstrual phase, begins at day 1 and lasts till approximately day 5. The uterus sheds its inner lining of soft tissue and blood vessels, which exits the body. Cramps are caused by the contraction of the uterine and the abdominal muscles to expel the menstrual fluid.
The natural element _IODINE_ is important in the synthesis of thyroid hormone; lack of it will lead to a goiter.