This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Pharmacology
Find therapeutic index of drug from the information given below in the graph 
Select and explain. 
A. 128, B. 1024, C. 8, D. 16
D: 16
Answer: D: 16 
Explanation: TI = LD50/ED50 TI = 128 mg/8 mg = 16