This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal System, Subject name: Physiology
[{'content': 'Highest frequency of BER is seen in which of the following? \nSelect and explain. \nA. Stomach, B. Duodenum, C. Jejunum, D. Ileum', 'role': 'user'}, {'content': 'Answer: B \nExplanation: BER - Basal electrical rhythm is the frequency of the electrical activity (slow waves) in the digestive tract. Stomach = 3-4/min., Duodenum = 12/min, jejunum = 9/min, ileum = 7/min.', 'role': 'assistant'}]