<prompt> Arrest of labour is defined as Failure of the head of the fetus to descend within___.1 hour2 hours3 hours4 hours  <response>: Ans- B Note- Arrest of labor is defined as Failure of the head of the fetus to descend for 3hours among primiparas and 2 hours among multiparas without an epidural analgesia 1 hour each if epidural analgesia is administered. 