Calculating the chance of survival?
If the chance of surviving for 5 years after being diagnosed with colorectal cancer is 45% and the chance of surviving for 2 years after diagnosis is 75%, what is the chance of surviving for 5 years after diagnosis, given that the patients is alive at the end of the second year?
A) 15%
B) 30%
C) 45%
D) 60%
E) 75%
