Approximately 2 billion people in the world have one of the following diseases, which one is it?

Question

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According to the World Health Organization (WHO), approximately 2 billion people in the world have iron-deficiency anemia, which is caused by a lack of iron in the body. This makes it the most common of the four diseases listed. Iodine deficiency affects around 1.9 billion people, vitamin A deficiency affects around 250 million children, and zinc deficiency affects around 2 billion people worldwide, but it is not clear if all of these individuals are experiencing significant health consequences.

Approximately 2 Billion People in the World Have One of the Following