If a patient experiences worsening symptoms from late spring to early summer, what allergen is most likely responsible?

The correct answer indicates that grass pollen is most likely responsible for the worsening symptoms experienced by the patient during late spring to early summer. This is consistent with seasonal allergies, as different types of pollen are prevalent during specific times of the year.

In late spring to early summer, many grasses release their pollen, which can trigger asthma symptoms in sensitive individuals. This timing is critical, as tree pollen tends to peak earlier in the spring, making it less likely to be the cause of symptoms at this particular time. Ragweed, on the other hand, typically becomes more prevalent later in the summer and into the fall, so it wouldn't be responsible for worsening symptoms in late spring. Mold spores can also be an issue, but their peak season often varies and is not specifically aligned with this time frame as closely as grass pollen.