<prompt> Which amongst the following biological agents has the highest potential for use as a biological weapon for microbial bioterrorism -Plague Yersinia pestisSmall pox variola majorBotulism Cl. botulinumBrucellosis Brucella sp  <response>: Plague, smallpox and Botulinum all belong to category A agents of microbial bioterrorism as classified by U.S. Centre for Disease Control and Prevention CDC. All these agents represent high risk to national security and represent potentially dangerous agents as biological weapons.The highly contagious nature and high mortality of plague make it a close to an ideal agent of bioterrorism, particularly if delivered in a weaponized form. 