What is the Flatworm Excretory Organ Called

Question

What is the flatworm excretory organ called?
A)Protonephridium
B)Mesonephridium
C)Metanephridium
D)Nephridium
E)Eunephridium

Accepted Answer

Flatworms have a type of excretory organ called a protonephridium, which is also known as a flame cell system. This organ is responsible for filtering waste and excess water from the body of the worm.