Fred and Sally took 5 medical tests. Fred's test results for T1, T2, T3, T4, T5 are Negative, Negative, Positive, Negative, Negative. Sally's results are Negative, Negative, Positive, Positive, Negative. Based on the common knowledge that medical tests are typically asymmetric binary variables, their distance is:

A) 0.2

B) 0

C) 0.5

D) 1