instruction:
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.
question:
Sentence1: Some viruses live in a dormant state inside the body. 
Sentence2: a virus can live in the brain.
answer:
viruses


question:
Sentence1: Hydrogen bonds cause water to expand when it freezes. 
Sentence2: Hydrogen bonds Hydrogen bonds are primarily electrostatic in origin.
answer:
Hydrogen


question:
Sentence1: Hagfish are noted for secreting large amounts of thick, slimy mucus. 
Sentence2: Hagfish are noted for secreting large amounts of mucus where bacteria then thrive.
answer:

Hagfish