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
Toxigenicity of tetanus is done on 
Select and explain. 
A. Rabbit, B. Horse, C. Mouse, D. Guinea Pig
C: Mouse
Answer: C: Mouse 
Explanation: In vivo: In vivo toxigenicity of tetanus is tested in a mouse. A 2-4 day old cooked meat culture is inoculated into the root of the tail of a mouse. A second mouse that has received the tetanus antitoxin an hour earlier serves as the control. Symptoms develop in the test animal in 12-24 hours, beginning with the stiffness in the tail. The animal dies within two days. Reference: Textbook of Microbiology; Anathanarayan and paniker's; 10th edition; Page no: 267