This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diseases of Cornea, Subject name: Ophthalmology
[{'content': 'Not an indication of given prosthesis : \nSelect and explain. \nA. Crouzon Disease, B. OCP( Stage 1 or 2), C. Multiple failed Penetrating Keratoplasty, D. Epidermolysis Bullosa Acquisita', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Boston Keratoprosthesis Indications *SJS, OCP( Stage 3 Or 4 ), TEN, Epidermolysis Bullosa Acquisita *Chemical Injury *Loss Of Lids( Crouzon Disease) *Vascularised cornea with complete stem cell deficiency And dryness *Aniridia With severe corneal changes *Multiple failed Penetrating Keratoplasty', 'role': 'assistant'}]