Question 19 What causes Folate deficiency?
sunscreen
UVB radiation
living near the North or South Pole
Excess vitamin D

My Explanation would be equivalent to the last answer (Excess Vitamin D).

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Explanation:

One of the most common causes of folate deficiency is not eating a healthy, balanced diet. A healthy diet includes foods that naturally contain folate or are enriched with folic acid.

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