**Core Concept**
The permissible dose of radiation from man-made sources is a critical concept in radiation safety, aiming to minimize the risk of radiation-induced harm to individuals and the environment. The dose is measured in rads per year, with strict guidelines to prevent excessive exposure.

**Why the Correct Answer is Right**
The permissible dose of radiation from man-made sources is set by regulatory agencies, such as the International Commission on Radiological Protection (ICRP). The correct answer is 5 rads per year, which is the maximum acceptable dose to prevent stochastic effects like cancer and genetic damage. This dose is based on the linear no-threshold (LNT) model, assuming that any radiation exposure carries some risk, no matter how small.

**Why Each Wrong Option is Incorrect**
**Option A:** 0.5 rads per year is too low to be practically achievable or relevant in most medical or industrial settings.
**Option B:** 10 rads per year exceeds the maximum permissible dose, increasing the risk of radiation-induced harm.
**Option C:** 2 rads per year is below the threshold for stochastic effects but may still pose a risk, depending on individual circumstances.

**Clinical Pearl / High-Yield Fact**
Remember that the permissible dose of radiation from man-made sources is a moving target, as new research and guidelines may alter the acceptable limits.

**Correct Answer: B. 10 rads per year is excessive and not permissible.**