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 laxative acts by opening of Chloride channels ? 
Select and explain. 
A. Docusate, B. Anthraquinone, C. Lubiprostone, D. Bisacodyl
C: Lubiprostone
Answer: C: Lubiprostone 
Explanation: Ans. is 'c' i.e., Lubiprostone o Lubiprostone is used for chronic constipation, it acts by - o Stimulating Cl- channel opening in the intestine. Increasing liquid secretion in gut. Decreasing transit time.