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What is the minimum distance required between a toilet and a sidewall in a residential building?

  1. 300 mm

  2. 350 mm

  3. 400 mm

  4. 450 mm

The correct answer is: 400 mm

The minimum distance required between a toilet and a sidewall in a residential building is 400 mm. This is because the Building Code of Australia specifies that there must be a minimum of 400 mm of clearance on one side of the toilet for easy access and use. Options A, B, and D (300 mm, 350 mm, and 450 mm) are all less than the required minimum distance and would not meet the building code standards. Therefore, C is the correct answer.