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
Nutra sweet is: 
Select and explain. 
A. Saccharin., B. Aspartame., C. Xylitol., D. Sorbitol.
B: Aspartame.
Answer: B: Aspartame. 
Explanation: Saccharin and aspartame are two artificial sweeteners commonly available. Saccharin is 100 times sweeter than sucrose and contains no calories.
Aspartame, commonly known as nutra sweet, is a combination of the aminoacids, aspartic acid and phenylalanine. It is 200 times more sweeter than sucrose.