This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diagnosis in Obstetrics, Subject name: Gynaecology & Obstetrics
[{'content': 'The following curve is used in evaluation to \nSelect and explain. \nA. Non progression of labor, B. Fetal distress, C. Rh incompatibility, D. Fetal maturity', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. C. Rh incompatibilityThe image shows Lily's curve, which is used to predict the severity of fetal hemolysis.The optical density of liquor containing bilirubin pigment is observed at wavelength 250-700nm. In presence of bilirubin, there is a deviation bulge/peak at 450nm. Bigger the bulge, more is the effect on the fetus.", 'role': 'assistant'}]