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: Microbiology
Which of the following is a Diploid cell Line? 
Select and explain. 
A. HeLa, B. Hep2, C. Chick embryo cell line, D. WI - 38
D: WI - 38
Answer: D: WI - 38 
Explanation: Primary cell Line - Chick embryo cell line, Rhesus monkey kidney cell line.
Diploid cell Line - Human fibroblast cell line or WI - 38
Continuous cell line - HeLa, Hep2, BHK, Mcoy.