JT is a 25 year old obese White male with a history of asthma, diagnosed when he was 13 years old. He also has a history of hypertension and type 2 diabetes mellitus. His recent COVID-19 test was negative. JT reports that he stayed at a friend's house two day ago, and since then he has experienced nocturnal wheezing and chest tightness. When asked about potential asthma triggers he states that his friend smokes cigarettes and has 2 cats in his home. JT's pulse oximetry reading is 92% on room air. The results of a spirometry measurement indicate a restriction in his airflow volume.

According to the updated guidelines published by the GINA and the NAEP, what medication should be added to JT's regimen as a first-line treatment of his asthma?
a. An inhaled long-term corticosteroid
b. An oral leukotriene modifier
c. A subcutaneous biologic medication
d. No answer text provided.