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.
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Question: Sentence1: Information on DNA is organized into genes. 
Sentence2: DNA codes for proteins.

Answer: DNA


Question: Sentence1: Coral reefs provide food and shelter to many ocean organisms. 
Sentence2: Coral Reefs Coral reefs are threatened.

Answer: Coral


Question: Sentence1: Any antigen that causes an allergy is called an allergen. 
Sentence2: Antibodies are produced to fight an allergens.

Answer:
allergen