Nitrogen (N) is actually a macronutrient, required in large quantities by plants.
Microelements are nutrients needed in small amounts, such as Manganese (Mn), Iron (Fe), Zinc (Zn), and Copper (Cu).
Magnesium (Mg) and Sulphur (S) are also macronutrients.
Therefore, Nitrogen is not a microelement, so this is a tricky question.