This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
[{'content': 'Intrauterine growth restriction is defined as: \nSelect and explain. \nA. There is oligohydramnios, B. The fetus weight less than 2.5 kg, C. Fetus fails to achieve growth potential, D. Duration of pregnancy more than 40 weeks', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Fetus fails to achieve growth potential', 'role': 'assistant'}]