This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
[{'content': 'In general systolic BP in young females is less than that in the males of same age due to \nSelect and explain. \nA. Dietary habits, B. Oestrogen which prevents atherosclerosis, C. Progesterone effect on blood vessels, D. Low sympathetic activity', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In females before menopause SBP is 4-5 mmhg less than that in the males of same age .After menopause SBP is 4-5 mmhg more than males of same age. This effect may be due to oestrogen which prevents atherosclerosis. Ref: page number 349 Textbook of physiology Volume 1 AK Jain 7th edition', 'role': 'assistant'}]