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: Ophthalmology
[{'content': 'The operation of plication of inferior lid retractors is indicated in: \nSelect and explain. \nA. Senile ectropion, B. Senile entropion, C. Cicatricial entropion, D. Paralytic entropion', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Senile entropion', 'role': 'assistant'}]