This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Forensic Medicine
Corneal tattooing may be done with 
Select and explain. 
A. Gold chloride, B. Calcium chloride, C. Copper sulfate, D. Potassium permanganate
A: Gold chloride
Answer: A: Gold chloride 
Explanation: Gold chloride Ref ; Narayana reddy 33rd ed.