Final answer:
In a clinical trial of a certain drug used to treat asthma, 16 out of 259 treated subjects experienced headaches.
Step-by-step explanation:
In a clinical trial of a certain drug used to treat asthma, 16 out of 259 treated subjects experienced headaches. Headaches can be a side effect of medications, including those used to treat asthma. It is important to closely monitor and report any side effects to a healthcare professional.