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
Unilateral trigeminal N. injury is tested by : 
Select and explain. 
A. Elevation and lowering of jaw, B. Inability to tense the jaw, C. Blinking of eye, D. All
A: Elevation and lowering of jaw
Answer: A: Elevation and lowering of jaw 
Explanation: A. i.e. Elevation & Lowering of jaw