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': 'Which of the following is not a treatment modality for Keratoconus \nSelect and explain. \nA. Spectacle, B. Prism, C. Contact lens, D. INTACS', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Prism -Prisms are used in Squint and not in keratoconus Rx Protocol for Keratoconus 1. SPECTACLE 2. CONTACT LENSES USED IN KERATOCONUS *Rigid Gas Permeable *Scleral lenses *Rose K lenses *Soper lenses 3. COLLAGEN CROSS LINKING C3R: INTACS Penetrating keratoplasty 4.INTACS Intracorneal ring segments *Reduce corneal steepening, made of PMMA. *Used in Pellucid Marginal Degeneration, post LASIK ectasia and keratoconus. 5.SURGERY *DALK (deep anterior Lamellar keratoplasty) *ALTK (Anterior lamellar therapeutic keratoplasty) *Penetrating Keratoplasty: When full thickness of cornea is involved as in hydrops with scar', 'role': 'assistant'}]