<prompt> All are true about Bacillus except:Mc Fadyeans reaction is used in presumptive diagnosis of anthrax infectionMedusa head appearance of colonies in gelatin stab culturePLET is the selective mediumAscolis thermoprecipitation test is used for laboratory diagnosis  <response>: Ans. is b i.e., Medusa head appearance of colonies in gelatin stab cultureMedusa head appearance is seen on agar microscopy, Bamboo stick appearance seen on gram staining.PLET - stands for Polymyxin, Lysozyme, EDTA and Thallous acetate 