Question

A person with antigen A on RBC and anti B antibody in plasma
A. Belongs to blood group A
B. Belongs to blood group B
C. Belongs to blood group O
D. Belongs to blood group AB

Answer 1

Blood is a fluid-like material present in humans and other animals that constantly circulating throughout the whole body to deliver necessary substances like nutrients and oxygen to the cells and remove waste products away from those same cells. It is connective tissue.

Complete step by step answer: Blood is a connective tissue that is fluid-like in nature. It is found mostly in humans and other animals and it circulates throughout the body by the network of blood vessels and helps in delivering necessary substances such as nutrients and respiratory gases such as oxygen to the cells and transports metabolic waste products away from those same cells.
There are various systems introduced for the classification of blood groups in the human population that are ABO, Rh, Kidd, Kell, Duffy, MSN, and Lewis. Among these systems, the most important are ABO and Rh systems.
In the ABO blood group system, the classification of human blood is done based on the inherited properties of red blood cells i.e. erythrocytes. Here, the blood groups are determined by the presence or absence of the antigens A and B, which are carried on the surface of the red cells. There are generally four types of blood groups found in human beings according to this system and these are A, B, AB, and O.
Antigens are the molecules present in the blood which are capable to stimulate an immune response. Each antigen consists of specific surface features, or epitopes and it results in specific responses. Antibodies are the Y-shaped proteins found in the blood produced by B cells of the immune system in response to exposure to antigens. There are two types of antigens p[resent; A and B. Antibodies are also two types; anti A and anti B.
In the case of blood group O, there are no antigens found but both the antibodies i.e. anti A and anti B present. In A blood group, antigen A and anti B antibody is present while in the B blood group, there are antigen B and anti A antibody present. And in the AB blood group, both antigens present but no antibodies are found.
Therefore, the correct option is option A.

Note: Blood is an important fluid of the body which helps to transport the nutrients and oxygen to support the various metabolic processes. It also helps to remove the waste product of the cells. According to the presence of antigens and antibodies it is classified into the four groups that are A, B, O, and AB. This is known as ABO system of blood group.