HardHealth
What is the rarest blood type?
Riddle
What is the rarest blood type?
Choose an answer
A.O Negative
B.AB Negative
C.B Positive
D.Rhnull
Hint: It's a word with 6 letters, starting with "R".
Answer
Rhnull
Why this is the answer
Rh-null has no Rh antigens at all; only about 50 people worldwide have it.
This riddle is filed under Science Riddles and rated Hard.