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: Dental
In formocresol, formaldehyde and cresol are in the ratio of: 
Select and explain. 
A. 1:02, B. 2:01, C. 1:01, D. 1:03
A: 1:02
Answer: A: 1:02 
Explanation: Formocresol
19%      Formoceresol
35%      ceresol
15%      Glycerine
Rest – water