One who is well-versed in any subject; a critical judge of any art, particularly fine arts

A. Veteran

B. Philistine

C. Dilettante

D. Connoisseur

Answer: Option D

Solution(By Examveda Team)

One word substitute is Connoisseur.

Veteran: a person who has had long experience in a particular field.
Philistine: a person who is hostile or indifferent to culture and the arts.
Dilettante: a person who cultivates an area of interest, such as the arts, without real commitment or knowledge.
Connoisseur: an expert judge in matters of taste.