system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Ceain sign of onset of labor: March 2013
assistant
The correct answer is  Ans. D i.e. Formation of bag of waters The first symptom to appear is intermittent painful uterine contractions followed by expulsion of blood stained mucus (show) per vaginum But formation of 'bag of membranes' is almost a ceain sign of onset of labor