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: Unknown
[{'content': 'Anti-D gamma globulin following first trimester abortion is - \nSelect and explain. \nA. 50mg, B. 100mg, C. 200mg, D. 300mg', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans-A', 'role': 'assistant'}]