This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Pharmacology
[{'content': 'Best for treatment of irritable bowel syndrome with spastic colon is \nSelect and explain. \nA. Liquid paraffin, B. Senna, C. Bisacodyl, D. Dietary fibers', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. d (Dietary fibers). (Ref. KD Tripathi 5th ed. - 614)Spastic constipation/Irritable bowel1st choice laxative:# Dietary fibers# Bulk forming laxative such as Ispaghula, methylcellulose.While Stimulant purgatives like:# Castor oil,# Senna,# Bisacodyl, Phenolphthalein........ are contraindicated.', 'role': 'assistant'}]