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: Social & Preventive Medicine
[{'content': 'Which one of the following is categorised as a high \nSelect and explain. \nA. Birth order 3, B. Maternal height 150 cm, C. Twins pregnancy, D. Blood group AB +ve', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]