Medusa head colonies on nutrient agar is seen in -: (A) Pneumococcus, (B) Legionella, (C) Brucella, (D) Anthrax
Answer is D. Ans. is 'd' i.e., Anthrax * Important characteristics of B. anthracis : 'Inverted fir tree' appearance, 'frosted glass' appearance, medusahead colony, string of pearl's reaction, M' Fadyean's reaction.