It Took a National Tragedy to Force a Much-Needed Update

It took a national tragedy to force a much-needed update of the Food and Drugs Act of 1906.The drug that caused this national tragedy was ________.

A) Ayer's Cherry Pectoral, which was used to treat respiratory ailments
B) Cocaine Toothache Drops, which was used to treat toothache pain
C) sulfonamide, an anti-infective drug
D) thalidomide, which was used to treat morning sickness