Task: Class Definition Understanding (ontology: Food_Agriculture/Crop_Ontology)

Which of the following definitions best describes 'Rust disease severity on leaves GH method'?

A. Quantification of symptom development
B. Record photoperiod response of flowering. Generally measured at Palmira, based on delay of flowering under 18h artificial day length vs 12.5h natural day length.
C. Quantification of symptom development, Primary leaves (V2).
D. Quantification of symptom development, Emergence (V1), Flowering (R6), Pod filling (R8)

Answer: Quantification of symptom development, Primary leaves (V2).