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Androgens can be described as those hormones that contribute to the development and maintenance of male characteristics. They are generally present in higher quantities in males than females, although females do have them. The primary and most well-known androgen is testosterone.

(a) Oestrogens are a group of hormones that play a big role in the menstrual cycle and in the promotion of female secondary sexual characteristics such as the breasts. Thus, they are not considered androgens. (b) Progesterone is a female hormone produced mainly in the ovary. It helps prepare the body for conception and pregnancy and regulates the menstrual cycle. Thus, it is not an androgen. (c) Testosterone is primarily produced in the testes and is the hormone responsible for the development of male sexual characteristics. Thus, it is considered an androgen. (d) Relaxin is a hormone produced by the ovary and the placenta with important effects in the female reproductive system and during pregnancy. Thus, it is not an androgen.

Among the given options, Testosterone is clearly the hormone that belongs to the category of Androgens. The other options, Oestrogens, Progesterone, and Relaxin, are hormones but do not fall within the category of Androgens.