Which of the following statements best explains why thalidomide enantiomers have different biological effects?

• A. One enantiomer has a higher molecular weight than the other.
• B. One enantiomer is more soluble in water than the other.
• C. One enantiomer is more stable than the other.
• D. One enantiomer interacts differently with chiral receptors in the body.

Answer: (D)