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
Platysma is supplied by? 
Select and explain. 
A. Cervical branch of facial nerve, B. Cervical branch of accessory nerve, C. Ansa cervicalis, D. Mandibular nerve
A: Cervical branch of facial nerve
Answer: A: Cervical branch of facial nerve 
Explanation: None