Verified Answer :

Bird flu is a relatively new disease. Hope this helps!

Answer:

Option B

Explanation:

Small pox disease was discovered Edward Jenner in 1796. The disease causing agent of Tuberculosis i.e bacteria Mycobacterium tuberculosis was however discovered in March 1882 by Dr. Robert Koch

The first interaction of HPAI A(H5N1) virus  with human was reported in year 1997 in Hong kong.

And first case of polio was reproted in  Vermont in U.S. in 1894

hence, among all the bird flu is the most recent disease

Option B is correct