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: Surgery
[{'content': 'All are true of standardized moality ratio except: \nSelect and explain. \nA. Expressed as rate per year, B. Can be adjusted for age, C. Can be used for events other than death, D. Ratio of observed deaths to expected deaths', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Expressed as rate per year Standardized moality ratio (SMR) = Expected death/ Observed deaths x 100 If the ratio had value greater than 100, the risk of moality rises. * SMR permit adjustment for age and it is of value if the event of interest is occurrence of disease rather than death. * Other standardization techniques * Life table * Regression techniques * Multivariate analysis', 'role': 'assistant'}]