Vestigial tail in humans is
a)	Thoracic vertebrae	b)	Lumber vertebrae	c)	Sacral vertebrae	d)	Caudal vertebrae

(d)

Caudal.

Sacral and coccygeal (caudal) vertebrae are fused vertebrae in human beings

Sacral vertebrae First five sacral vertebrae gets fused to form sacrum. It is a strong and short supporting pelvic girdle as it (sacrum) articulates with the ilium of pelvic girdle

Caudal or coccygeal vertebrae Mainly 3 to 4 caudal vertebrae gets fused to form a small triangular bone called coccyx. It is the vestigial tail in humans