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: Forensic Medicine
[{'content': 'Rigor mois in a foetus develops after attaining: \nSelect and explain. \nA. 3 months of age, B. 4 months of age, C. 7 months of age, D. 10 months of age', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. 7 months of age', 'role': 'assistant'}]