The hazard marking minimum dimensions for Genetically Modified Organisms must be at least:

• A. 50 mm x 50 mm
• B. 4 mm x 4 mm
• C. 100 mm x 100 mm
• D. 500 mm x 500 mm

Answer: (A)

The idea being tested is that hazard markings must be large enough to be clearly seen and read to ensure safe handling and proper identification. For Genetically Modified Organisms, the minimum marking area is a 50 mm by 50 mm square, which provides sufficient visibility for the pictogram and any required text across typical transport conditions. A 4 mm square would be unreadable, while 100 mm by 100 mm or 500 mm by 500 mm exceed the minimum and aren’t the required baseline, though larger marks can be used if needed.