A Persister Cell Is an Unsolved Mystery of Microbiology Because

A persister cell is an unsolved mystery of microbiology because these cells

A) grow rapidly in the presence of antibiotics.
B) neither grow nor die in the presence of an antibiotic.
C) cannot exit log phase growth when placed in an optimum antibiotic niche.
D) can form neither individual cells nor biofilms.
E) cycle between animal and human populations, never dying out.