This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
Medusahead colonies on nutrient agar point the diagnosis of infection with 
Select and explain. 
A. Bacillus anthracis, B. Bacillus cereus, C. Anthracoid bacilli, D. Clostridium per fringes
A: Bacillus anthracis
Answer: A: Bacillus anthracis 
Explanation: Bacillus anthracis-medusa hair appearance like growth on nutrient agar Ref: Textbook of Microbiology Baveja 5th ed Pg 220