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 risk pregnancy ? \nSelect and explain. \nA. Bih order 3, B. Maternal height 150 cm, C. Twins pregnancy, D. Blood group AB +ve', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Twins pregnancy", 'role': 'assistant'}]