**Core Concept:** Deterministic effects of radiation refer to the irreversible damage caused by radiation exposure, leading to visible clinical consequences. These effects are generally dose-dependent and occur at higher doses.

**Why the Correct Answer is Right:** In the context of fetal development, deterministic effects from radiation are less likely to occur at lower doses. The threshold for deterministic effects is the minimum dose required to cause a specific clinical outcome.

For example, a dose below 100 mSv is generally considered safe for pregnant women, as deterministic effects are unlikely to occur. This threshold can vary depending on the type of radiation and the stage of gestation.

**Why Each Wrong Option is Incorrect:**

A. This option is incorrect because the correct answer is provided.
B. This option is incorrect because deterministic effects are less likely to occur at lower doses, not higher doses.
C. This option is incorrect for the same reason as option A, providing the correct answer.
D. This option is incorrect as deterministic effects are less likely to occur at lower doses, and this option suggests higher doses.

**Clinical Pearl:** Deterministic effects are generally dose-dependent, meaning their likelihood increases as the radiation dose increases. In the context of fetal development, it is crucial to consider the potential risks associated with radiation exposure, especially during pregnancy. Adequate protection measures should be implemented to minimize the risk of deterministic effects due to radiation exposure.

**Correct Answer:** .