༒︎༒︎🅴︎🅿︎🅸︎🅝︎🅴︎🅿︎🅷︎🅡︎🅸︎🅽︎🅴︎༒︎༒︎
Antibodies of Rh system are produced only
in Rh– individual.
Erythroblastosis fetalis is possible only when mother is Rh– and fetus is Rh+, because Rh antibodies are produced only in Rh– individuals when they are exposed to Rh+ R.B.C.