The aldohexose D-(+)-galactose can be obtained by hydrolysis of lactose, a disaccharide found in milk. When D-(+)-galactose is treated with nitric acid, it yields an optically inactive aldaric acid. When D-(+)-galactose is subjected to Ruff degradation, it yields D-(-)- lyxose. Using only these data, write the Fischer projection formula for D-(+)-galactose.