Which one of the following abnormalities in the host is associated to Wuchereria, Plasmodium and Fasciola respectively?
I. Parasitic castration
II. Hyperplasia
III. Febrile paroxysm
IV. Peritonitis
V. Lymphangitis
In Arthropoda, head and thorax are often fused to form cephalothorax, but in which one of the following classes, the body is divided into head, thorax and abdomen?