Final answer:
Nerve tissue is the most radio-resistant among the given options because nerve cells do not regularly divide, making them less vulnerable to radiation compared to tissues with rapidly dividing cells.
Step-by-step explanation:
Among the options given, nerve tissue is considered to be the most radio-resistant. This is because nerve cells generally do not divide after they are fully developed, making them less susceptible to radiation compared to tissues with rapidly dividing cells such as bone marrow, intestinal tissue, hair follicles, and reproductive organs. These rapidly dividing cells are typically more affected by radiation because they are more likely to incur damage during cell division which can then be propagated to daughter cells.
In contrast, muscle tissue, bone tissue, and skin tissue all contain cells that either divide regularly, as in the case of skin, or can be induced to divide in response to injury or other stimuli, like in muscle and bone. However, they are still more resistant to radiation than the tissues comprised predominantly of rapidly dividing cells.