**Core Concept**
Superfecundation refers to the fertilization of eggs from two different ovulatory cycles by sperm from two different males, resulting in a twin pregnancy with genetically distinct fetuses. This phenomenon occurs when a woman releases more than one egg and is fertilized by sperm from different men, typically due to ovulation occurring at different times.

**Why the Correct Answer is Right**
Superfecundation involves the fertilization of two separate eggs from the same cycle or different cycles by sperm from different males, leading to twins with different genetic origins. This is distinct from superfetation, which involves conception of a second embryo after the first has already begun development. In this case, the pregnancy is due to two different men, meaning two separate sperm contributions—this fits the definition of superfecundation. It is a well-documented occurrence in forensic medicine, particularly in cases of disputed paternity.

**Why Each Wrong Option is Incorrect**
Option A: Superfetation involves conception of a second embryo after the first has already begun development—this is not the case here, as the twins are conceived from two different men at different times, not sequentially.
Option C: Both of the above is incorrect because superfetation does not involve two different men; it involves a single pregnancy with two fetuses developed at different times, not from different fathers.

**Clinical Pearl / High-Yield Fact**
In forensic medicine, superfecundation can lead to a misattribution of paternity if not properly evaluated. Always consider the timing of ovulation and sperm samples when assessing biological relationships in twin pregnancies.

✓ Correct Answer: B. Superfecundation