Causal organism that led to the outbreak of Bengal famine is

Answer: Option A

A causal organism that led to the outbreak of the Bengal famine is Helminthosporium oryzae.
Cochliobolus miyabeanus (formerly known as Helminthosporium oryzae) is a fungus that causes brown spot disease in rice.
It is an important plant pathogen because it causes a common and widespread rice disease that causes s high level of crop yield losses. It was a major cause of the Bengal famine of 1943, where the crop yields dropped by 40% to 90% and the death of 2 million people was recorded.