Which of the following statements is true about chiral drug molecules?
a) Only 1 enantiomer is efficacious and the other enantiomer is toxic or has some other bad side effect. Only the 1 enantiomer can be used safely as a drug.
b) Only 1 enantiomer is efficacious but the other enantiomer is harmless. Both the pure enantiomer and the racemate can be used safely as a drug.
c) Both enantiomers are efficacious. Either pure enantiomer or the racemate can be used safely as a drug.
d) All of the above can be true, it just depends on the specific compounds involved.