<prompt> Answer this question truthfullyWhat are Koplik spots and what condition are they pathognomonic for?  <response>: <reason> Koplik spots are bluish-white lesions that appear on the buccal mucosa inner lining of the cheeks and are pathognomonic for measles. Measles is a highly contagious viral infection that is characterized by fever, cough, runny nose, and a rash that spreads from the face to the rest of the body. Koplik spots are named after the American pediatrician Henry Koplik, who first described them in 1896. 