This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Radiotherapy, Subject name: Radiology
[{'content': 'The recommended monthly limit to the fetus is \nSelect and explain. \nA. 0.05 mSv, B. 0.1 mSv, C. 0.5 mSv, D. 2 mSv', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The NCRP recommends a monthly limit of 0.5 mSv (50 mrem) to the embryo or fetus once a woman declares her pregnancy. In contrast to this, the ICRP recommends a limit of 2 mSv (200 mrem) to the surface of the woman&;s abdomen (lower trunk) for the remainder of the pregnancy. These recommendations are essentially similar and are designed to limit the risk of mental retardation, other congenital malformations, and carcinogenesisReference: Eric J Hall Textbook of Radiobiology for Radiologist; 5th edition', 'role': 'assistant'}]