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: Pharmacology
Which of the following anti emetic acts by stimulating cannabinoid - 1 (CB1) receptors 
Select and explain. 
A. Aprepitant, B. Dronabinol, C. Apomorphine, D. Prucalopride
B: Dronabinol
Answer: B: Dronabinol 
Explanation: Dronabinol is an anti - emetic which acts by stimulating Cannabinoid -1 receptors which also can stimulate appetite.