**Core Concept**
Warfarin, a commonly used oral anticoagulant, crosses the placental barrier and can cause fetal harm, particularly when administered during the first trimester of pregnancy. This is due to its inhibition of vitamin K-dependent enzymes, which are crucial for the synthesis of osteocalcin and other proteins involved in bone and cartilage development.

**Why the Correct Answer is Right**
Chondrodysplasia Punctata (CDP) is a rare congenital disorder characterized by abnormalities in bone and cartilage development. Warfarin exposure during pregnancy is a known risk factor for CDP, as it interferes with the gamma-carboxylation of osteocalcin, leading to defective bone and cartilage formation. This results in characteristic findings such as stippling (punctate calcifications) in the epiphyses of long bones, short stature, and other skeletal anomalies.

**Why Each Wrong Option is Incorrect**
* **Option A:** Long bones limb defect is not a direct consequence of warfarin exposure during pregnancy. While warfarin can affect bone development, it is not specifically associated with long bone limb defects.
* **Option B:** Cranial malformation is not a typical congenital malformation associated with warfarin exposure. While warfarin can cause various fetal abnormalities, cranial malformations are not commonly linked to its use during pregnancy.
* **Option C:** Cardiovascular malformation is not a direct consequence of warfarin exposure during pregnancy. While warfarin can increase the risk of fetal anomalies, cardiovascular malformations are not specifically associated with its use.

**Clinical Pearl / High-Yield Fact**
Warfarin exposure during pregnancy is a known risk factor for Chondrodysplasia Punctata, a rare congenital disorder characterized by abnormalities in bone and cartilage development. This highlights the importance of using alternative anticoagulants during pregnancy whenever possible.

**✓ Correct Answer: D. Chondrodysplasia Punctata**