5. Please choose one wrong statement regarding pathogen transmission and infection? (A) In airborne transmission of pathogens, droplet nuclei are large particles (＞5 micrometer diameter) that can travel ＜ 1 meter. (B) Colonization of a microbial pathogen on or within host is not necessarily result in tissue invasion or damage. (C) Based on lethal dose 50 (LD50), bacterial strain A (LD50 = 5000) is more virulent than bacterial strain B (LD50 = 7500). (D) Intoxications are diseases that result from entry of a specific performed toxin into host. (E) Reservoir is a natural environmental location in which the pathogen normally resides.