In embryonic stage $RBCs$ develop in
Liver and kidney
Liver and spleen
Spleen and kidney
Liver and pancreas
The cells which directly attack and destroy the antigens are known as
Sickle cell aneamia is more common in South Africa. This is due to
The drug 'cyclosporin' used for organ transplant patients is obtained from a
Which one of the following diseases is due to an allergic reaction