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: Dental
A copolymer which has a direct chain of one type and branches of other type is called a 
Select and explain. 
A. Graft copolymer, B. Block copolymer, C. Random polymerisation, D. Branched chain polymerization
A: Graft copolymer
Answer: A: Graft copolymer 
Explanation: None