**Core Concept**
Post term pregnancy refers to a pregnancy that continues beyond the expected due date, typically defined as 42 weeks of gestation. This condition poses risks to both the mother and the fetus, including increased risk of stillbirth, fetal distress, and complications during delivery.

**Why the Correct Answer is Right**
The correct answer is based on the definition of post term pregnancy, which is generally accepted as 42 weeks of gestation. This duration is calculated from the first day of the last menstrual period (LMP). Each week is approximately 7 days, so 42 weeks would be equivalent to 294 days (42 x 7 = 294). This definition is used to identify pregnancies that are at higher risk of complications and may require closer monitoring or earlier delivery.

**Why Each Wrong Option is Incorrect**
**Option A:** 274 days is equivalent to approximately 39 weeks of gestation, which is still within the normal gestational age range and not considered post term.
**Option B:** 284 days is equivalent to approximately 40 weeks and 6 days of gestation, which may be near the end of the normal gestational age range but is not yet post term.
**Option D:** 304 days is equivalent to approximately 43 weeks and 4 days of gestation, which is actually considered post term but exceeds the commonly used cutoff of 42 weeks.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that the risk of stillbirth and other complications increases significantly after 42 weeks of gestation. Therefore, it is essential for healthcare providers to closely monitor post term pregnancies and consider delivery options, such as induction of labor or cesarean section, to ensure the best possible outcomes for both the mother and the fetus.

**✓ Correct Answer: C. 294 days**