Step 1: Read each item in List I and think about what it describes.
List I gives four descriptive terms used clinically or on ultrasound. List II gives four diagnoses. We need to match each term to the diagnosis it points to.
Step 2: Match star gazing fetus.
A star gazing fetus has a neck that stays sharply extended, so the face points upward as if looking at the sky. This posture is seen when the head stays extended in a breech baby instead of being tucked to the chest. So A matches 2, breech with extended head.
Step 3: Match frog eye appearance.
In anencephaly the skull vault above the orbits is missing, so the eyes look unusually prominent and bulging, giving a frog like face on scan. So B matches 3, anencephaly.
Step 4: Match Buddha's position.
In hydrops fetalis, fluid collects under the skin and in the abdomen, so the fetus looks bloated with the legs spread apart over a swollen belly, like a seated Buddha statue. So C matches 4, hydrops fetalis.
Step 5: Match partus conduplicato corpore.
This term means birth with a folded body. It describes how a long neglected transverse lie can still deliver on its own: the soft fetus bends double at the trunk and passes through the pelvis folded over itself. So D matches 1, transverse lie.
Step 6: Rule out the other codes.
Any code that pairs star gazing with anencephaly, or pairs Buddha's position with transverse lie, swaps the correct posture and diagnosis, so codes (a), (b), and (c) each contain at least one wrong pair.
Final Answer:
The correct set of matches is A-2, B-3, C-4, D-1.