The study found that "the sun shines happily" has sufficient scientific basis. When the sun shines on the skin, the vitamin D3 produced by the human body will make the brain secrete a kind of vitamin

The study found that "the sun shines happily" has sufficient scientific basis. When the sun shines on the skin, the vitamin D3 produced by the human body will make the brain secrete a kind of vitamin D 3. B

Test analysis: "Happiness" is the subjective reflection of the human brain when the sun shines on the skin, which shows that the human brain is the material organ of consciousness activity, the human brain is the physiological basis of consciousness, and consciousness is the function of the human brain, and B is correct; Consciousness is the subjective image of objective existence. Without objective existence, there will be no consciousness, so objective existence is the source of consciousness. A is wrong. Consciousness is the subjective image of the objective existence of the human brain, not the spontaneous existence of the human brain, C error; D is the origin of consciousness, which is inconsistent with the meaning of the question.