GLP requirements include which of the following elements?

• A. Responsibilities of all individuals, SOPs, a detail plan, results and data
• B. A description of the lab layout
• C. A training schedule only
• D. A list of approved solvents

Answer: (D)

GLP emphasizes reliable, traceable materials and methods. A key requirement is controlling reagents and solvents used in studies. Having a list of approved solvents means every solvent has been evaluated for purity, origin, and suitability, with documented lot numbers and specifications. This control prevents variability or contamination from using inappropriate or inferior solvents, supporting consistency, method validity, and auditability of the data.

While GLP does involve elements like documented responsibilities, SOPs, study plans, data handling, and QA, the most direct, observable GLP element among the options is the approved solvents list. It represents the material controls that underpin data integrity, ensuring that the only solvents used meet predefined quality criteria.