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
The most serious alkali burns of the eye are produced by: 
Select and explain. 
A. Strong liquid ammonia, B. Caustic soda, C. Lime, D. None of the above
A: Strong liquid ammonia
Answer: A: Strong liquid ammonia 
Explanation: Ans. Strong liquid ammonia