Ecdysone is produced by
a)	Prothoracic gland	b)	Corpora cardiaca	c)	Corpora allata	d)	Abdominal gland

(a)

The moulting hormone of the prothoracic glands, named ecdyson, was isolated in a crystalline form in 1954 by Butenandt and Karlson. Ecdyson is a steroid hormone, known to trigger moulting it acts on the tissue to promote all the changes characterizing a moult.