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: Unknown
True about genetics of cancer - 
Select and explain. 
A. Topoisomerase II is useful for breaking double stranded DNA, B. Increased telomerase activity enhances anti tumour effect, C. Maximum synthesis of DNA occurs during G2 phase, D. Transition from G2 to M phase is important in blockage of cancer spread
A: Topoisomerase II is useful for breaking double stranded DNA
Answer: A: Topoisomerase II is useful for breaking double stranded DNA 
Explanation: Ans-A