Microbiology All are true about Bacillus except: A Mc Fadyean's reaction is used in presumptive diagnosis of anthrax infection B Medusa head appearance of colonies in gelatin stab culture C PLET is the selective medium D Ascoli's thermoprecipitation test is used for laboratory diagnosis 💡 Explanation All are true about Bacillus except: ✓ Correct Answer: B. Medusa head appearance of colonies in gelatin stab culture