This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Histamine, 5-HT and PGs, Subject name: Pharmacology
Which of the following drug is a 5HT2c agonist approved for treatment of obesity and causes Serotonin Syndrome as an adverse effect? 
Select and explain. 
A. Lorcaserin, B. Sibutramine, C. Modafinil, D. Rimonabant
A: Lorcaserin
Answer: A: Lorcaserin 
Explanation: Lorcaserin: 5HT2c agonist Causes weight loss S/E: Serotonin syndrome Sibutramine: Serotonin and nor-adrenaline reuptake inhibitor Discontinued due to increased risk of stroke Modafinil: used in treatment of Narcolepsy Rimonabant: Inverse agonist of cannabinoid receptor - 1 Causes weight loss Prevents craving of alcohol S/E: psychological problems (withdrawn)