This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abnormal labor, Subject name: Gynaecology & Obstetrics
Blood in urine in a patient in labour is diagnostic of: 
Select and explain. 
A. impending scar rupture, B. Urethral injury, C. Obstructed labour, D. Cystitis
A: impending scar rupture
Answer: A: impending scar rupture 
Explanation: Blood in urine in a patient in labour is indicative of scar rupture.Previous history of classical cesarean section makes woman vulnerable to unpredictable rupture of uterus. (DC DUTTA TB of obstetrics 8th edtn pg 383)