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
Which of the following is enantiomer 
Select and explain. 
A. a) D Glucose and L Glucose, B. b) D Fructose and L Fructose, C. c) D Mannose and L Mannose, D. d) D Glyceraldehyde and L Glyceraldehyde.
C: c) D Mannose and L Mannose
Answer: C: c) D Mannose and L Mannose 
Explanation: Explanation- Enantiomers (D and L isomerism) - *D sugars are naturally occurring. Examples areD Glucose and L GlucoseD Fructose and L FructoseD Mannose and L MannoseD Glyceraldehyde and L Glyceraldehyde