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': 'What is the normal weight gain during pregnancy? \nSelect and explain. \nA. 1 to 3 kg, B. 5 to 7 kg, C. 10 to 12 kg, D. 12 to 15 kg', 'role': 'user'}, {'content': "Answer: C \nExplanation: The total weight gain during the course of a singleton pregnancy for a healthy woman averages 11 kg (24 lb). This has been distributed to 1 kg in 1st trimester and 5 kg each in second and third trimester. Gestational weight gain recommendations are based on a woman's pre-pregnancy body mass index (BMI). BMI < 18.5 Underweight: - Mean rate of weight gain in the 2nd and 3rd trimester = 0.5 kg/week; Recommended range of total weight gain = 12.5 - 18 kg. BMI 18.5 - 24.9 Normal weight: - Mean rate of weight gain in the 2nd and 3rd trimester = 0.4 kg/week; Recommended range of total weight gain = 11.5 - 16 kg. BMI 25.0 - 29.9 Overweight: - Mean rate of weight gain in the 2nd and 3rd trimester = 0.3 kg; Recommended range of total weight gain = 7 - 11.5 kg. BMI >= 30 Obese: - Mean rate of weight gain in the 2nd and 3rd trimester = 0.2 kg/week; Recommended range of total weight gain = 5 - 9kg.", 'role': 'assistant'}]