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
Xylometazoline nasal drops given before nasotracheal intubation to 
Select and explain. 
A. Vasoconstriction of nasal mucosa, B. Dilatation of orifices, C. Decrease secretion, D. Dilation of posterior
A: Vasoconstriction of nasal mucosa
Answer: A: Vasoconstriction of nasal mucosa 
Explanation: None