This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Retina, Subject name: Ophthalmology
[{'content': 'PASCAL is used for \nSelect and explain. \nA. Angiography, B. Laser photocoagulation, C. RNFL thickness, D. Ganglion cell layer', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Laser photocagulations RETINAL INSTRUMENTS * OCT: Measure RNFL thickness, Ganglion cell volume, Optic nerve head parameters & retinal layers. Cystoid Macular edema is classified according to OCT classification. * OCT- Angio that shows retinal vasculature without the use of dye. * PASCAL- Patterned scanned laser used for photocoagulation. * Spectralis- can do FA, OCT, ICG in same machine. * Retcam 3- Seeing & documenting pediatric retinal diseases, (ROP, Choroidopathies & Dystrophies) * Fugo blade- Used for both anterior, posterior capsulorrhexis & PHPV.', 'role': 'assistant'}]