बच्चों के विकास के लिए इसमें से कौन-सा तत्व उनके आहार में होना आवश्यक है? Which element is essential to be in diet for the development of children?

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बच्चों के विकास के लिए इसमें से कौन-सा तत्व उनके आहार में होना आवश्यक है? Which element is essential to be in diet for the development of children?