a person whose blood group is B required blood transfusion name the possible blood groups of the donors

if he is B negative :  he can only receive blood from other B negative donors or from type O negative donors

and if he is B positive : B positive patients can receive blood from B positive, B negative, O positive and O negative donors.  

Explanation:

fossil's are like over rated rocks like low key not gonna lie i don't get why we can't just call them old rocks like for real i mean i call my grandpa and grandma that smh