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: ENT
Which test can detect facial nerve palsy occurring due to the lesion at the outlet of stylomastoid foramen - 
Select and explain. 
A. Deviation of angle of mouth towards opposite side, B. Loss of taste sensation in anterior 2/3 of tongue, C. Loss of sensation over right cheek, D. Deviation of tongue towards opposite side
A: Deviation of angle of mouth towards opposite side
Answer: A: Deviation of angle of mouth towards opposite side 
Explanation: Injury at stylomastoid foramen causes LMN palsy, so the face sags and drawn across to the opposite side.
Chorda tympani is spared at this level, taste sensation over anterior 2/3 of tongue is preserved.