In addition to ABO blood group, there are other types of human blood group, such as GM blood group. GM blood group exists in human serum and shows obvious ethnic specificity. FB subtype like GM blood group is unique to Caucasians; St subtype only exists in yellow people; The C3 subtype is only found in black people.
Which of the followings can be infered
All Africans have the C3 subtype of the GM blood group