This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Nervous tissue Rabies vaccines are usually manufactured from 
Select and explain. 
A. Duck embryos, B. Human diploid cell, C. Sheep, D. Chick embryos
C: Sheep
Answer: C: Sheep 
Explanation: None