In the attack of which class of nematodes, presence of white to brown cysts projecting on the root surface is a characteristic symptom

Answer: Option B

In the attack of Globodera class of nematodes, the presence of white to brown cysts projecting on the root surface is a characteristic symptom.
Globodera is a species of nematode in the family of Heteroderidae. It is well known as a plant pathogen, especially in potatoes and tomatoes.
the egg containing white cysts (pallida) or golden cysts (rostochiensis) can be found on the roots of potato plants.