2. He gives or sells or causes to be given or sold any alcoholic beverage, as defined by section three of the alcoholic beverage control law, to a person less than twenty-one years old; except that this subdivision does not apply to the parent or guardian of such a person or to a person who gives or causes to be given any such alcoholic beverage to a person under the age of twenty-one years, who is a student in a curriculum licensed or registered by the state education department, where the tasting or imbibing of alcoholic beverages is required in courses that are part of the required curriculum, provided such alcoholic beverages are given only for instructional purposes during classes conducted pursuant to such curriculum.
(Emphasis mine).