some dividing cells exit the cell cycle g0stage at the end of m/g1phase
Hello Komal!
I think I can understand the question you have asked. I guess you want to know that which is the correct answer between M-phase and G1-phase.
Some dividing cells at the end of mitotic phase(i.e M-phase) exits the cell cycle and enter into a vegetative inactive stage also called the quiescent phase.
The correct answer would be M-phase.
I hope your doubt is cleared.
Happy learning!