Which immunization should be considered carefully before being given to a child receiving chemotherapy for cancer?

A. Diphtheria, pertussis, tetanus (DPT) is incorrect because DPT is an inactivated or toxoid vaccine, which is generally safe for immunocompromised children, though efficacy may be reduced during chemotherapy. B. Measles, rubella, mumps (MMR) is correct because MMR is a live attenuated vaccine. Live vaccines pose a risk of causing infection in immunocompromised children, such as those receiving chemotherapy. Administration should be postponed until immune function recovers, or given with careful evaluation by the healthcare provider. C. Tetanus vaccine is incorrect because the tetanus vaccine is a toxoid, not live, and is generally safe for children with compromised immunity. D. Inactivated poliovirus vaccine is incorrect because the inactivated polio vaccine is not live and can be safely administered to immunocompromised children, though immune response may be less robust.