Concept:
Pomology is the study of fruit crops. Fruits are classified on the basis of their origin, structure and development.
Step 1: Identify fig fruit type.
Fig develops from a hollow fleshy receptacle that encloses many small flowers inside it.
\[
\text{Fig} \rightarrow \text{Syconium}
\]
Step 2: Compare with other fruit types.
Pome is found in apple and pear.
Drupe is found in mango and coconut.
Balusta is associated with pomegranate.
Step 3: Final answer.
Therefore, pomologically, fig is classified as syconium.
\[
\therefore \text{Correct Answer is (D)}
\]