Task: Inferred Class Relation Reasoning (ontology: Human_Society/EmotionOntology)

After reasoning, which of the following classes is one valid superclass of 'circadian sleep/wake cycle, REM sleep'?

A. hearing
B. appraisal of causal intent
C. envenomation resulting in modulation of mast cell degranulation in other organism
D. rhythmic behavior

Answer: rhythmic behavior