This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: JIPMER 2017, Subject name: Radiology
Hydatid sand is made of: 
Select and explain. 
A. Scolex, B. Cyst, C. Protscolex, D. Brood capsule
C: Protscolex
Answer: C: Protscolex 
Explanation: * On USG, the hydatid sand looks like an echogenic material floating inside the cystic fluid. Its major component is Protoscolex.