 
 <prompt> How FDA dey make sure say public dey safe? Based on di last question, write something wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: For US, new medicine must get approval from FDA say e dey safe and e dey work well. Dem go submit Investigational New Drug file with pre-clinical data for human trials. After dem approve IND, dem fit do three phases of human trials wey dey increase in size. Phase I dey study toxicity with healthy volunteers. Phase II fit include how drug dey work for patients, and Phase III na big study to see if e dey work well for the people wey need am. After dem complete Phase III testing, dem go submit New Drug Application to FDA. FDA go review the data and if dem see say the product dey give better benefit than risk, dem go approve am to sell for US. 