system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Initiator in developer solution is
assistant
The correct answer is  Developer converts exposed silver halide crystals into metallic silver grains. Two developing agents, usually phenidone and hydroquinone, are used in dental radiology.
White and Pharoah, pg-69