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Which of the sentences below best expresses the essential information in the following sentence. Incorrect choices change the meaning in important ways or leave out essential information.
While the use of psychiatric drugs has been in existence for over fifty years, improvements in the understanding of brain chemistry and the consequent discovery of new drug types have greatly expanded their use, and there are now drugs available for the treatment of nearly every major form of psychiatric disorder.
A) While psychiatric drugs have existed for over fifty years, their expanded use and the invention of new drugs now allow doctors to treat nearly every form of mental illness.
B) Although these drugs are not new, discoveries relating to brain chemistry and the resulting development of new drugs have greatly expanded the use of psychiatric drugs to include treatment of most mental illnesses.
C) Although psychiatric drugs are not new, improvements in brain chemistry have only recently allowed them to be used to treat most mental illnesses.
D) Psychiatric drugs have been around for nearly fifty years, but the improvements they can make in brain chemistry have greatly expanded their use, and there are now drugs for most mental illnesses.
What is B) Although these drugs are not new, discoveries relating to brain chemistry and the resulting development of new drugs have greatly expanded the use of psychiatric drugs to include treatment of most mental illnesses.