Concept:The scolex is the head of a tapeworm, specialised for anchoring the parasite to its host.
Explanation:An adult tapeworm has a knoblike head called the scolex.
The scolex is equipped with hooks and suckers.
These structures help the tapeworm attach firmly to the intestinal wall of the host.
Thus, the scolex does not perform excretion, movement, or breathing.
Its main role is attachment.
Answer:B. attachment to the host