This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
Which of the following is primary cell line - 
Select and explain. 
A. Chick embryo fibroblast, B. Hela cells, C. Vero cells, D. WI-38
A: Chick embryo fibroblast
Answer: A: Chick embryo fibroblast 
Explanation: Primary cell cultures:These are normal cells freshly taken from the body and cultured. Common examples are monkey kidney,human embryonic kidney,human amnion and chick embryo cell cultures. REF:ANANTHANARAYAN AND PANIKER'S TEXTBOOK OF MICROBIOLOGY 9TH EDITION PAGE NO:435