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': 'A child, Ramu has swallowed the contents of 2 bottles of a nasal decongestant whose primary ingredient is α adrenoceptor agonist drug. The signs of α activation that may occur in this patient include: \nSelect and explain. \nA. Tachycardia, B. Dilatation of pupil, C. Vasodilation, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]