The conversation between human and AI assistant.
[|Human|] What is the most common symptom of a cold?
[|AI|] The most common symptom of a cold is a runny or stuffy nose. Other common symptoms include sneezing, coughing, sore throat, headache, and fatigue. These symptoms usually appear one to three days after exposure to the virus and last for about a week.
[|Human|] 
What is the most common symptom of a cold?