Hormone which is responsible for development of secondary sexual characteristics in males isA Testosterone B Oestrogen C Thyroxine D Adrenaline

Breakdown of the Problem

We need to identify which hormone is primarily responsible for the development of secondary sexual characteristics in males. The given options are:

1. Testosterone
2. Oestrogen
3. Thyroxine
4. Adrenaline

Relevant Concepts

1. Testosterone: This is the principal male sex hormone and plays a key role in the development of male reproductive tissues as well as promoting secondary sexual characteristics such as increased muscle and bone mass, and the growth of body hair.
2. Oestrogen: This is primarily a female sex hormone, although males also produce it in smaller amounts.
3. Thyroxine: This hormone is produced by the thyroid gland and is involved in metabolism, not the development of secondary sexual characteristics.
4. Adrenaline: This hormone is involved in the body's fight-or-flight response and does not play a significant role in sexual development.

Analysis and Detail

Upon analyzing the functions of each hormone:

• Testosterone is known specifically for its role in male physical development.
• Oestrogen, while crucial for females, also appears in males but does not promote male secondary characteristics.
• Thyroxine influences overall metabolism and does not relate to sexual development.
• Adrenaline affects stress responses and physiological reactions rather than sexual characteristics.

Verify and Summarize

Given that testosterone is the only hormone directly involved in the development of male secondary sexual characteristics as detailed above, we can confirm that it is the correct answer.

Final Answer

The hormone responsible for the development of secondary sexual characteristics in males is A. Testosterone.