Question

Match List I with List II 

• A. A-IV, B-I, C-III, D-II
• B. A-III, B-I, C-IV, D-II
• C. A-I, B-III, C-IV, D-II
• D. A-II, B-IV, C-I, D-III

Hint:

"Coenurus cerebralis" causes "gid" in sheep, which is a brain disease.
Matching D-II and combining it with the muscle-dwelling "Cysticercus bovis" (A-III) allows you to find the correct match (B) instantly.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Metacestodes are the larval stages of tapeworms (family Taeniidae) that develop in the tissues of intermediate hosts (mammals) following the ingestion of eggs shed by definitive hosts (dogs, humans).
Each species of metacestode has a highly specific anatomical site where it prefers to localize (site of predilection).

Step 2: Detailed Explanation:
Let us match each larval tapeworm stage with its preferred anatomical site:
- A. Cysticercus bovis: This is the larval stage of Taenia saginata (the human beef tapeworm).
It is found in the skeletal and cardiac muscles of cattle, producing a condition known as "beef measles".
Thus, A matches with III.
- B. Cysticercus tenuicollis: This is the larval stage of Taenia hydatigena of dogs.
It develops on the omentum, mesentery, and peritoneal membranes (peritoneum) of sheep, goats, and pigs.
Thus, B matches with I.
- C. Coenurus serialis: This is the larval stage of Taenia serialis of dogs.
It typically develops in the subcutaneous and intermuscular connective tissues of lagomorphs (rabbits and hares).
Thus, C matches with IV.
- D. Coenurus cerebralis: This is the larval stage of Taenia multiceps of dogs.
It localizes in the brain and spinal cord (central nervous system) of sheep and goats, causing the neurological disease "gid" or "sturdy".
Thus, D matches with II.

Step 3: Final Answer:
Matching these parameters gives: A-III, B-I, C-IV, D-II, which corresponds to option (B).