This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Normal Labour, Subject name: Gynaecology & Obstetrics
Arrest disorder is defined as the cessation of cervical dilatation in active phase of labor of more than: 
Select and explain. 
A. 1 hour, B. 1.2 hours, C. 1.5 hours, D. 2 hours
D: 2 hours
Answer: D: 2 hours 
Explanation: Ans. D. 2 hours* Secondary arrest is defined when the active phase of labor (cervical dilatation) commences normally but stops or slows significantly for 2 hours or more prior to the full dilatation of the cervix.* It is commonly due to malposition or cephalopelvic disproportion.'Cessation of active phase of dilatation by more than 2 hours is defined as arrest' Danforth.