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': 'Of the following conditions most painful is: \nSelect and explain. \nA. Stye, B. Hordeolum internum, C. Ulcerative blepharitis, D. Inflammation of gland of Moll', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Hordeolum internum', 'role': 'assistant'}]