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
An OPV l shows this symbol on it. What does it indicate?
assistant
The correct answer is  The pictures below show the interpretation of vaccine l monitor on the OPV vaccine l: - If color of inside square lighter than outside circle - We can use the vaccine - It is heat sensitive label that indicates cumulative heat exposure over time.