Generate an overlapping word between the given two sentences. When you find the overlapping words, they don't have to match exactly, e.g., "survival" and "survive" are valid overlapping words. Little words like "the" or "of" don't count! You must generate significant words which are not the stop words.

[Q]: Sentence1: Distance is measured in meters the SI unit of distance. 
Sentence2: The SI unit of distance is in meters.
[A]: SI


[Q]: Sentence1: Electrical currents cause magnetic fields. 
Sentence2: Electrical currents can cause objects to repel each other.
[A]: Electrical


[Q]: Sentence1: threatening behavior causes a fight-or-flight response in animals. 
Sentence2: Stress triggers the fight or flight response within the body.
[A]:
fight-or-flight