Which of the following exhibit the lowest degree of radiosensitivity?

In the context of radiosensitivity, different tissues and stages of development exhibit varying responses to radiation exposure. The correct answer indicates that males generally have a lower degree of radiosensitivity compared to unborn children or fetuses. This reduced sensitivity is partly due to their fully developed organs and tissues, which are less susceptible to the harmful effects of radiation compared to those of developing embryos or fetuses, which are still undergoing significant growth and differentiation.

Unborn children and fetuses are in critical stages of development where rapid cell division occurs, making them more vulnerable to radiation-induced damage. Tissues actively undergoing mitosis are typically more sensitive to radiation due to the higher likelihood of cellular mutations or death during this process.

While the radiosensitivity of males and females can be influenced by various biological and environmental factors, in a general sense, the developing stages (embryonic and fetal) are recognized for their heightened radiosensitivity compared to the already developed tissues present in males and females. Thus, males tend to exhibit the lowest degree of radiosensitivity among the choices listed.