Which one of the following pairs is not correctly matched?
Vitamin- $B_{12}$ Pernicious anaemia
Vitamin- $B_{6} \ldots$ Dermatitis
Vitamin- $B_{1} \ldots$ Beri-beri
Vitamin-$B$$_{2}$ - Pellagra
Lymphocytes secrete a protein which causes the dilation of blood vessels. The protein is
A chemical substance produced by a microorganism for inhibiting the growth of another is
Widal test is carried out to test
Immunity is provided by
Motile elongate zygote of Plasmodium occurs in