Concept:
Antonyms are words having opposite meanings.
Step 1: Find the antonym of “Chronic”.
“Chronic” means long-lasting.
Its opposite is:
\[
\text{Temporary}
\]
Thus,
\[
A \rightarrow IV
\]
Step 2: Find the antonym of “Hereditary”.
“Hereditary” means inherited genetically.
Its opposite is:
\[
\text{Acquired}
\]
Thus,
\[
B \rightarrow III
\]
Step 3: Find the antonym of “Philistine”.
“Philistine” refers to an uncultured person.
Its opposite is:
\[
\text{Cultured}
\]
Thus,
\[
C \rightarrow II
\]
Step 4: Find the antonym of “Gloomy”.
“Gloomy” means sad or dark.
Its opposite is:
\[
\text{Radiant}
\]
Thus,
\[
D \rightarrow I
\]
Step 5: Write the final matching.
\[
A-IV,\; B-III,\; C-II,\; D-I
\]
Step 6: Conclusion.
Hence, the correct answer is:
\[
\boxed{A-IV,\; B-III,\; C-II,\; D-I}
\]