This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Ophthalmology
[{'content': 'Which of the following is/are the side effect of using argon laser- \nSelect and explain. \nA. Hypopigmentation, B. Crusting, C. Keloid formation, D. All the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Argon Laser *Wavelength 488-514 nm *Penetration depth of 1mm, which can be increased by cooling. *Side effects: crusting and possible blistering of skin, irreversible hypopigmentation, transient hyperpigmentation, punctate atrophic or hyperophic scars, keloid formation. Ref: Lasers in otolaryngology by Karl bernd p.144', 'role': 'assistant'}]