This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Optics and refraction, Subject name: Ophthalmology
[{'content': 'Which of the following is/are the side effects of using an argon laser? \nSelect and explain. \nA. Hypopigmentation, B. Crusting, C. Keloid formation, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Argon Laser Wavelength 488-514 nm The penetration depth of 1mm, which can be increased by cooling Side effects: crusting and possible blistering of the skin, irreversible hypopigmentation, transient hyperpigmentation, punctate, atrophic or hyperophic scars, keloid formation Reference : AK Khurana Comprehensive Ophthalmology, 6th edition, pg no. 461 - 462', 'role': 'assistant'}]