This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
Which of the following is/ are the side effect/ s of using argon laser ? 
Select and explain. 
A. Hypopigmentation, B. Crusting, C. Keloid formation, D. All the above
D: All the above
Answer: D: All the above 
Explanation: Ans. is 'd' i.e., All the above Argon Laser Wavelength 488 - 514 nm Penetration depth of 1 mm, 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.