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(A) Vitamin D
(B) Vitamin A
(C) Vitamin B
(D) Vitamin E
Answer: (A) Vitamin D
Explanation: Vitamin D is the vitamin produced in response to sunlight. When UV rays from the sun hit the skin, they trigger the synthesis of vitamin D, which is essential for calcium absorption and bone health. Unlike vitamins A, B, and C, which are obtained from dietary sources, vitamin D’s production is uniquely stimulated by exposure to sunlight.