If a drug that is already on the market has the potential to help adults and children who have the same disease, or if it is widely used in children and the absence of labeling seems dangerous, the FDA can require that the drug undergo pediatric study.

• Athat the drug undergo  
• Bthat the drug undergoes  
• Cthat the drug is to undergo  
• Dthe drug undergoing  
• Ethe drug to have to undergo