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
"Therapeutic" index is: 
Select and explain. 
A. an approximate assessment of the safety of the drug., B. The dose expected to kill one half of population, C. The dose produces desired response, D. The dose produces 1000 mortality
A: an approximate assessment of the safety of the drug.
Answer: A: an approximate assessment of the safety of the drug. 
Explanation: None