Study of flags is called _________?

A. Vexillology
B. Zoosology
C. Spermology
D. None of these

Vexillology is the study of the history, symbolism and usage of flags or, by extension, any interest in flags in general. The word is a synthesis of the Latin word vexillum and the Greek suffix -logia. The first known usage of the word vexillology was in 1959.