Which one of the following is the cause of Corn smut? (MP RAEO 2021 Shift 1)

🔑Key Points:
-Ustilago maydis is the causal agent or pathogen responsible for corn smut.
-Corn smut, also known as Ustilago maydis or maize smut, is a fungal disease that affects corn (maize) plants.
-Ustilago maydis is a plant pathogenic fungus that infects corn plants during their growth and development.
-The infection by Ustilago maydis leads to the formation of swollen, tumor-like growths or galls on various parts of the corn plant, including the ears, tassels, stalks, and leaves.
-These galls caused by Ustilago maydis contain a mass of dark spores and can adversely affect the growth, development, and yield of corn crops.

-While corn smut is considered a disease that affects corn plants, it is also consumed as a culinary delicacy in some cultures, where the galls or "huitlacoche" are used as a food ingredient.🛑Additional Information:
-Fungi: Ustilago zeae – Corn Smut
-Fungi: Puccinia graminis tritici – Black rust of wheat
-Fungi: Monilinia fructicola – Brown Rot
Fungi: Alternaria solani – Early blight of tomato