From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.
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Question: Given Relationship: 'be candidate for', Sentence: 'I believe that Barack Obama is the best candidate to succeed George W. Bush as President of the United States .'

Answer: candidate

Question: Given Relationship: 'be president of', Sentence: 'Barrack Obama has finally got elected as the President of the United States of America , after months of hard work and his unwavering faith in the electorate .'

Answer: President

Question: Given Relationship: 'be complication of', Sentence: 'Anemia is a common complication of CKD , mainly due to the inability of the kidneys to secrete enough erythropoietin to stimulate adequate hematopoiesis .'

Answer:
complication