This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Anatomy
[{'content': 'Pressure of normal uterine contractions is between 190-300 units. Which unit is being referred here? \nSelect and explain. \nA. Montevideo units, B. mm of Hg, C. cm of water, D. Joules /kg', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 1 Montevideo unit = Intensity of contraction x Number of contractions in 10 mins. It is used to define uterine activity. Clinical labour usually commences when the uterine activity reaches values between 80-120 Montevideo units i.e, 3 contractions of 40 mm Hg every 10 mins. During labour, Normal uterine contractions are between 190-300 Montevideo units . Ref: Williams Obs 23e pg 437.', 'role': 'assistant'}]