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: Unknown
[{'content': 'The earliest sign of placental separation is - \nSelect and explain. \nA. Change in shape and consistency of uterus, B. Sudden gush of blood, C. Protrusion of umbilical cord, D. Cessation of cord pulsations', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans-B', 'role': 'assistant'}]