A school always has a 

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RRB ALP Previous Paper 12 (Held On: 20 Aug 2018 Shift 1)
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  1. Headmaster
  2. Teacher
  3. Building
  4. Library

Answer (Detailed Solution Below)

Option 2 : Teacher
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Teacher is the basic unit of a school.

Teacher is the one who teach students so a school can exist without Headmaster, Building and Library but not without teacher.

So, A school always has a "Teacher".

Hence, Teacher is the correct answer. 

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