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: Anatomy
Muscle which dilates the palpebral apeure: 
Select and explain. 
A. Orbicularis oculi, B. Orbicularis oris, C. Levator palpebrae superioris, D. Levator labii superioris
C: Levator palpebrae superioris
Answer: C: Levator palpebrae superioris 
Explanation: The levator palpebrae superioris muscle elevates and retracts the upper eyelid.