B5 fixative contains formaldehyde and potassium dichromate.

• A. True
• B. False
• C. Not enough information
• D. Only formaldehyde

Answer: (B)

The main idea here is recognizing what B5 fixative is made of and which chemicals are typically used in it. B5 is a formaldehyde-based fixative used for preserving cytology specimens, and its standard formulation includes formaldehyde together with acetic acid (and sometimes other alcohol components). Potassium dichromate is not a component of B5. Chromate-based or chromium-containing fixatives do exist, but they belong to a different class with different properties and safety concerns. So the statement is false because B5 does not contain potassium dichromate.