Beyonce answered critics of her Inauguration Day performance the best way she could — with another sterling performance of the national anthem. The difference? On Thursday, it was live: She admitted during her Super Bowl news conference that when she performed for President Barack Obama and the nation, she decided to sing to a prerecorded track. Calling herself a self-proclaimed ‘‘perfectionist,’’ she said she wanted the day to go off without a hitch. ‘‘Due to no proper sound check, I did not feel comfortable taking a risk,” she explained.