Q. Which of the following is the state animal of Bihar?

Correct Answer: None of the above

Explanation:
The official state animal of Bihar is the Gaur (Indian bison, Bos gaurus). It is not a buffalo, bull, cow, or horse, so none of the given options are correct. 

A gaur is neither a bull nor a buffalo, but a wild bovine species native to South and Southeast Asia, often called the Indian Bison. It is the largest of the wild cattle and a close wild relative of domestic cattle, distinct from both the bull (a male domestic bovine) and the water buffalo