Task: Class Definition Understanding (ontology: Human_Society/EmotionOntology)

Which of the following definitions best describes 'canonical sad facial expression'?

A. The canonical facial expression associated with the experience of sadness.
B. The canonical facial expression associated with the experience of disgust.
C. The canonical facial expression associated with the experience of anger.
D. The canonical facial expression associated with the experience of fear.

Answer: The canonical facial expression associated with the experience of sadness.