In case anyone needed another reason to love chocolate, a new study suggests that a natural compound found in cocoa, tea and some vegetables can reverse age-related memory loss. The study - published in Nature Neuroscience in 2014 and partly financed by a chocolate company - found that flavanols reverse mild memory loss in older adults. Using brain scans and memory tests, the latest study built on previous work showing that flavanols extracted from cocoa beans had improved neuronal connections in mice's dentate gyrus, a part of the brain involved in memory formation. It can be learned from the passage that flavanol is ________.A. a compound that can reverse age-related memory lossB. a kind of cocoa beans that is used to produce chocolateC. a disease in older people that is caused by memory lossD. a part of the human brain that controls memory formation