issb general knowledge MCQ #286

Vitamin D is mainly produced by:

issb general knowledge MCQ #286

  1. Question 1

    Q1. Vitamin D is mainly produced by:

    • A) Darkness
    • B) Sunlight on skin
    • C) Only food always
    • D) Only water

    Answer: Sunlight on skin

    Explanation: Sunlight helps the skin produce vitamin D. This fact often appears in ISSB academic and general knowledge sections.