The ethical duty of a doctor is to prioritize patient care regardless of financial status. Providing free treatment if possible aligns with the principles of beneficence and justice, ensuring that patients receive necessary care without discrimination. This approach fosters trust and upholds the professional responsibility to alleviate suffering. When free treatment is feasible, it removes barriers to access and improves health outcomes. Denying care solely based on affordability is unethical and contradicts medical professionalism. Thus, offering free treatment when possible is the compassionate and correct course of action.

Reference: Principles and Practice of Surgery, O. James Garden, 7th Edition.