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: boiling means change from a liquid into a gas by adding heat energy. 
Sentence2: boiling changes a liquid into steam.
answer:
liquid


question:
Sentence1: Ribosomes are small organelles where proteins are made. 
Sentence2: Ribosomes are assembled inside the nucleus.
answer:
Ribosomes


question:
Sentence1: An allergy is a reaction to a substance the body recognizes as foreign. 
Sentence2: Antigens are molecules that can cause an allergy.
answer:

An