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: Medicine
[{'content': 'In essential hypertention changes seen in the heart are - \nSelect and explain. \nA. Cardiac cell hyperplasia, B. Cardiac cell hypertrophy, C. Increase in the mitochondrial number, D. Increase in size of mitochondria', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]