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: Biochemistry
Action of 'Telomerase' is 
Select and explain. 
A. DNA repair, B. Longetivity of cell - Ageing, C. Breakdown of telomer, D. None
B: Longetivity of cell - Ageing
Answer: B: Longetivity of cell - Ageing 
Explanation: B i.e. Longetivity of cell- aging