What symptom is most commonly associated with measles?

Measles is a highly contagious viral infection that is characterized by a range of symptoms, particularly during the prodromal phase before the classic measles rash appears. The most common symptoms associated with measles include a prominent cough, conjunctivitis (inflammation of the conjunctiva in the eyes), and sometimes chills, as the body reacts to the viral infection.

Cough is a common symptom in measles due to the initial respiratory involvement of the virus, leading to irritation of the airways. Conjunctivitis often occurs as the virus can affect mucous membranes, leading to red, watery eyes. Chills can present as a general reaction to fever, which frequently accompanies the measles infection.

Given that many of these symptoms can present simultaneously and are all part of the clinical picture of measles, the option stating "all of the above" is appropriate as it encompasses the full spectrum of common symptoms associated with this disease.