This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
In the case of dogbite the biting animal should be observed for atleast - 
Select and explain. 
A. 5 days, B. 10 days, C. 15 days, D. 3 weeks
B: 10 days
Answer: B: 10 days 
Explanation: Post exposure prophylaxis may be discontinued if the suspected animal is proved by appropriate laboratory examination to be free of rabies or in the case of domestic dogs , cats or ferrats , the animals remain healthy throughout a 10 day observation period staing from the date of bite Reference; Park&;s Textbook of preventive and social medicine,24th edition.Pg no. 297