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: Social & Preventive Medicine
[{'content': 'The Hb level is healthy women has mean 13.5 g/dl and standard detion 1.5 g/dl, what is the Z score for a woman with Hb level 15.0 g/dl : \nSelect and explain. \nA. 9, B. 10, C. 2, D. 1', 'role': 'user'}, {'content': "Answer: D \nExplanation: Z-score indicates how much an observation is bigger or smaller than mean in units of S.D. Z = (Observation - Mean)/S.D Z = (15-13.5)/1.5 = 1 Ref: Park's Textbook Of Preventive And Social Medicine By K. Park, 19th Edition, Page 702; Park's Textbook Of Preventive And Social Medicine By K. Park, 18th Edition, Page 647; Methods in Biostatistics: For Medical Students and Research Workers By BK Mahajan, Page 82; High-Yield Biostatistics, By Anthony N. Glaser, Page 15", 'role': 'assistant'}]