Akiochi disease in rice is due to the toxicity caused by?

Correct option is D

Akiochi disease in rice is caused by the toxicity of Hydrogen Sulphide (H₂S). This toxic gas is produced in waterlogged soils due to anaerobic conditions, where the oxygen supply is limited. The accumulation of Hydrogen Sulphide can lead to various physiological and biochemical disruptions in rice plants, resulting in the symptoms associated with Akiochi disease.