In this task, You are given an open-domain question that can be answered based on factual information. Your task is to provide \*short\* answer (in a few words only) for the given question. The short answer can be one or more entities or it can also be boolean \*yes\* or \*no\*.
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Question: malware that essentially is a form of social engineering

Answer: Trojan horses


Question: what is the old name for south africa

Answer: Union of South Africa


Question: what is the sum of the protons and neutrons in an atom

Answer:
mass number