 
 <prompt> Wetin be di final step? Based on di previous question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: For US, new drug wey dem wan sell gats get approval from Food and Drug Administration (FDA) say e dey safe and e dey work well. Dis process dey involve submitting Investigational New Drug filing wey get pre-clinical data wey go support make dem do human trials. After dem approve the IND, dem fit do three phases of human trials wey dey increase in size. Phase I dey look into toxicity using people wey dey healthy. Phase II fit include how the drug dey work for body and dosing for patients, while Phase III na big study to see if the drug dey work well for the people wey dem dey target. After dem don finish Phase III testing successfully, dem go submit New Drug Application to FDA. FDA go review the data and if dem see say the drug get positive benefit-risk assessment, dem go approve make dem sell the drug for US. 