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': 'All are true about origin and propagation of contractions except \nSelect and explain. \nA. The right pacemaker predominates over left, B. Intensity of propagation is greatest at cervix, C. The contractiom spreads from pacemaker towards cervix, D. Speed of contraction is 2 cm/sec', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Intensity is greatest at fundus of uterus', 'role': 'assistant'}]