This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
[{'content': 'Which of the following are Enantiomers - \nSelect and explain. \nA. D-glucose and L-glucose, B. Glucose and galactose, C. Glucose and Mannose, D. d-glucose and 1-glucose', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., D-glucose and L-glucose D and L isomersThis type of isomerism depends on the orientation of H and OH group around the assymetric carbon atom just adjacent to terminal primary alcohol (penultimate carbon atom), e.g., carbon atom number 5 in glucose determines whether the sugar belongs to D or L isomer.When OH group on this carbon atom is on the right, it belongs to D-series, when it is on left, it is the member of L-series.D and L isomers are mirror images of each other.These two forms are called enantiomers of each other. Thus, D-glucose and L-glucose are enantiomers of each other.Similarly D-mannose and L-mannose, and D-galactose and L galactose are enantiomers.All propeies of the two members of an enantiomeric pairs (D-or L-series) are identical, they have same boiling point and melting point and the same solubility but they exhibit different optical activity", 'role': 'assistant'}]