At an initial examination in Baltimore,Maryland,disease X was found in 10 of 1,000 men aged 40 to 50 years and in 10 of 2,000 women aged 30 to 40 years.Which of the following statement is the most accurate inference for the risk of developing disease X?

A) Men have a 2 times greater risk of developing disease X than women.
B) Women have a 2 times greater risk of developing disease X than men.
C) People aged between 40 and 50 years have a 2 times greater burden of developing disease X than people aged between 30 and 40.
D) People aged between 30 and 40 years have a 2 times greater burden of developing disease X than people aged between 40 and 50.
E) We cannot make any inference of risk of developing disease X.

The information provided in question is only prevalence of disease X at an initial examination.Based on information from prevalence,we cannot make any inference for risk of developing disease X.We should have newly diagnosed cases in a certain amount of time with population at risk for risk calculation and comparison."Men have a 2 times greater risk of developing disease X than women," "Women have a 2 times greater risk of developing disease X than men," "People aged between 40 and 50 years have a 2 times greater burden of developing disease X than people aged between 30 and 40," and "People aged between 30 and 40 years have a 2 times greater burden of developing disease X than people aged between 40 and 50" are not correct.Because we cannot perform a risk comparison based on disease prevalence.The accurate statement on disease prevalence is "Men aged 40 to 50 years have 2 times of greater prevalence of disease X than women aged 30 to 40 years."