Micronutrients helps in preventing the skin from different types of allergens or pollen which may result in skin rashes or hives. It protects skin againts various pathogens or fungi. It acts as anti oxidants on skin and thus prevents premature ageing. It also protects from harmful UV radiateion which damages DNA.
He's actually a biologist who specializes in organic chemistry. But since that's not in the answer choices, i'd recommend putting Scientist or Dermatologist.
