The black wart disease of potato specially confined to Darjeeling hills is caused by pathogen

Answer: Option A

The black wart disease of potato specially confined to Darjeeling hills is caused by the pathogen Synchytrium endobioticum.
Potato wart disease is one of the most important quarantine pests for cultivated potato and is caused by the obligate biotrophic chytrid fungus Synchytrium endobioticum.
Potato wart is a soil-borne fungus that can remain dormant in a field for more than 40 years. Although potato wart poses no threat to human health or food safety, it has an impact on the economic return for potato growers by reducing yield and making potatoes unmarketable.