This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
Which one of the following is not a special incidence rate 
Select and explain. 
A. Attack rate, B. Secondary attack rate, C. Hospital admission rate, D. standardized moality rate
D: standardized moality rate
Answer: D: standardized moality rate 
Explanation: ref: Park's 23rd edition pg 58 All except D are special incidence rate. Standardised moality rate is adjusted moality rate, which removes the confounding effect of different age structures and yields a single standardised or adjusted rate by which moality experience can be directly compared.