Quarantine restriction has been imposed on which disease of wheat?

Answer: Option A

Quarantine restriction has been imposed on Karnal bunt disease of wheat.
Karnal bunt is a fungal disease of wheat, durum wheat, and triticale. The smut fungus Tilletia indica, a basidiomycete, invades the kernels and obtains nutrients from the endosperm, leaving behind waste products with a disagreeable odour.
Karnal bunt is an internationally quarantine-significant fungal disease of wheat. Implementing an emergency quarantine, inspection, and certification program for wheat moving out of the infested areas, along with regulations on sanitizing machinery and storage facilities.