This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
Supranuclear lesion of facial nerve affects 
Select and explain. 
A. Lower pa of face, B. Upper pa of face, C. Face, D. Spares Face
A: Lower pa of face
Answer: A: Lower pa of face 
Explanation: It is caused by cerebrovascular accidents (haemorrhage, thrombosis or embolism), tumour or an abscess. It causes paralysis of only the lower half of face on the contralateral side. Forehead movements are retained due to bilateral innervation of frontalis muscle. Involuntary emotional movements and the tone of facial muscles are also retained. Ref: Dhingra 7e pg 107.