The minimum dimensions for the Infectious substance hazard label are:

The minimum dimensions for the Infectious substance hazard label are:

• A. 1 mm x 1 mm
• B. 4 mm x 4 mm
• C. 50 mm x 50 mm
• D. 400 mm x 400 mm

Answer: (C)

Label size matters because the infectious substances hazard label must be clearly visible and legible during handling and transport. Regulators set a minimum size so the biohazard symbol and any required text can be read from a reasonable distance and under different packing conditions. Among the options, 50 mm by 50 mm provides a practical, readable square that ensures the symbol is recognizable and the accompanying information can be read without crowding. The other options are either far too small to be seen or impractical for typical shipments. Hence, 50 mm by 50 mm is the correct minimum.