Leaf smut of rice is caused by

Answer: Option A

Leaf smut of rice is caused by Entyloma oryzae.
Leaf smut, caused by the fungus Entyloma oryzae, is a widely distributed, but somewhat minor, disease of rice. The fungus produces slightly raised, angular, black spots (sori) on both sides of the leaves.
This is a minor fungal disease in which small slightly raised black spots develop mostly on the leaves. Raised spots or pustules break open releasing air-borne spores.