Which organ is most likely to experience harmful biological effects from radiation exposure?

• A. Kidneys
• B. Breasts
• C. Brain
• D. Bladder

Answer: (B)

Radiosensitivity varies by tissue: organs with cells that divide rapidly are more prone to DNA damage from ionizing radiation and to developing radiation-induced effects. Breast tissue contains active epithelial cells that are quite responsive to radiation, making it relatively sensitive and a known site for radiation-related cancer risk. The brain, on the other hand, is composed mostly of non-dividing neurons, so it’s comparatively resistant unless exposure is very high. The kidneys and bladder can be affected, but their tissue is generally less radiosensitive than breast in typical exposure scenarios. So the breast stands out as the organ most likely to experience harmful biological effects from radiation among these options.