The correct option is B Tranquilizer
Chlordiazepoxide, tranquilizing drug used in the treatment of anxiety Chlordiazepoxide belongs to a group of chemically related compounds called benzodiazepines.
Tranquilizers are a class of chemical compounds used for the treatment of stress, and mild or even severe mental diseases. These relieve anxiety, stress, irritability or excitement by inducing a sense of well-being. They form an essential component of sleeping pills.