**Core Concept**
Ectopic pregnancy is a life-threatening condition where the fertilized egg implants outside the uterus, typically in the fallopian tube. Medical treatment options for ectopic pregnancy include methotrexate, a folate antagonist that inhibits dihydrofolate reductase (DHFR) enzyme, essential for DNA synthesis and cell division.

**Why the Correct Answer is Right**
Methotrexate is contraindicated in conditions where there is a high risk of fetal development, such as in the presence of an intrauterine pregnancy (IUP), as it can cause fetal malformations and death. In cases of ectopic pregnancy, the presence of an IUP would indicate a heterotopic pregnancy, where both an ectopic and an intrauterine pregnancy coexist. This is a rare but serious condition that requires careful management.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided, so it cannot be evaluated.
**Option B:** There is no specific contraindication for methotrexate treatment in cases of ruptured ectopic pregnancy. In fact, methotrexate is often used to treat unruptured ectopic pregnancies to avoid surgery.
**Option C:** There is no specific contraindication for methotrexate treatment in cases of ectopic pregnancy with a high hCG level. Methotrexate efficacy is not directly related to hCG levels.
**Option D:** This option is not provided, so it cannot be evaluated.

**Clinical Pearl / High-Yield Fact**
Methotrexate is a teratogenic agent and should be avoided in cases of suspected intrauterine pregnancy. A pelvic ultrasound is essential before administering methotrexate for ectopic pregnancy to rule out an IUP.

**Correct Answer: D.**