Which of the four blood groups, A, AB, B and O is called universal donor?

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Q: 304 (SSC/NA)

Which of the four blood groups, A, AB, B and O is called universal donor?
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question_subject: 

Science

question_exam: 

SSC

stats: 

0,10,3,10,0,2,1

keywords: 

{'blood groups': [3, 1, 1, 2], 'universal donor': [1, 0, 0, 0], 'ab': [0, 0, 1, 0]}