blood antibody Kaplan question

[greenseeking]

A woman who has never been pregnant has type B- blood Which of the following antibodies would you expect to find in her serum?

A. Anti-B Antibody
B. Anti-A Antibody
C. Anti-Rh antibody
D. Both Anti-A and Anti-Rh antibody.

I chose A. Anti-B Antibody.

The answer key says it's B. Anti-A Antibody.

I really have no idea why. If you have type B Blood, shouldn't you have Anti-B Antibodies?

Edit: Wait, figured it out. Sorry guys- late night studying is really getting to me. It should be B, otherwise, the Antibodies would start attacking the person's own blood cells.

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[acceptmeplease]

Because, she has never been pregnant, this rules out C and D. Had she been pregnant and potentially exposed to rH positive blood from the baby, her body would acquire an anti-rH antibody. This is why the Coombs test was developed.

She has B- blood, so she has no antigen against B blood. So ask yourself which blood could she have transfused? O- and B- are the answers. She would have a reaction to A.

 

[acceptmeplease]

Ha. Didn't see the update.

 

[greenseeking]

Thanks though!