Which Statement Is Not One of Koch's Postulates

Multiple Choice

Which statement is not one of Koch's postulates?

A) The microorganism is always found in the diseased individual.
B) A sample of the pure culture of the microorganism produces the disease when it is injected into an uninfected host.
C) The microorganism taken from the diseased host can be grown in pure culture.
D) The microorganism is always transmitted by insect vectors.
E) A host infected by injection from the cultured microorganism yields a new culture of the microorganism identical to the original culture.