Which Statement Is Not True

Which statement is not true?

A) From discovery to approval,the development of a new drug takes,on average,two years and $500,000.
B) The most controversial toxicity testing involves the determination of the lethal dose-50 (LD-50) ,the minimum dose that kills 50% of the test animals.
C) Clinical testing of drugs on humans cannot begin before the FDA has examined the results of the tests on animals.
D) The primary goal of the FDA is to establish whether a drug is effective and safe before it is sold to the public.