Question

A person with blood group B+ met with an accident and lost a lot of blood. Which pair of individuals can donate blood to him.
A. AB+, B+
B. AB-, B-
C. A+, B+
D. O+, B-

Answer 1

Hint: O- blood group is universal donor and AB+ is universal acceptor, only positive blood group of B+ person can accept B+, B-, O+ and O- type of blood group. Other Blood groups like AB, A donate B blood group person to his death. Such transfusions create blood coagulation.

Complete answer:
B+ blood group possess Antibody A and type B antigen, so that A person with B+ blood group only received from B- because of presence of the same antigen type and O blood group is also accepted by B+ blood group because this blood group does not bear any antigen.
In other blood groups like AB+ which carry both types of antigen but not possess any antibody, In case of A+ type of blood group which bear antigen A and Antibody b which cause coagulation of blood during transfusion to B+ blood group person. In the case of O type of blood group, it does not bear any antigen but shows A and B antibodies. So that’s why this type of blood group acts as a universal donor and it is accepted by that person which have B+ blood group. This O type blood group is accepted by any kind of blood group.
The –ve sign of the blood group represents the Rh factor which shows the presence or absence along with the blood group.
Except D. option, all the options are wrong due to wrong combination of blood groups, if such blood group is transfused to the necessary B+ blood group person, then it leads to blood coagulation and it will lead to death of that person.

So, the correct answer is D.

Note:
B+ blood group person receives or accepts O type blood group or B type blood group, rest of the blood group would threaten the life of B+ blood group person, except such four types of blood group there is one more blood group is found called as MN or Bombay type of blood group.