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
A study has been done to establish the relationship between smoking and lung cancer. It was found that the association was more in people who exercise less and less in people exercise more. In this situation, exercise is a
assistant
The correct answer is  Ans. c. Effect modifier