What fixatives are commonly used for rodent tissue histology, and why is fixation important?

• A. Bouin's fixative is standard for all rodent histology.
• B. 10% neutral-buffered formalin is standard for paraffin histology and fixation preserves tissue architecture.
• C. Glutaraldehyde is the preferred fixative for routine paraffin histology.
• D. Fixation is optional for routine histology.

Answer: (B)