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
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: 
Select and explain. 
A. Tachycardia, B. Dilatation of pupil, C. Vasodilation, D. All of the above
B: Dilatation of pupil
Answer: B: Dilatation of pupil 
Explanation: None