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
[{'content': 'Tadalafil acts on Phosphodiesterase 5 and causes accumulation of? \nSelect and explain. \nA. cAMP, B. cGMP, C. PAF, D. IL 10', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., cGMP", 'role': 'assistant'}]