Compared to a bull, a bullock is docile because of:
1. higher levels of thyroxine
2. higher levels of cortisone
3. lower levels of blood testosterone
4. lower levels of adrenalin/noradrenalin in its blood

Assertion: Prostaglandins send only paracrine (locally active) or autocrine (acting on the same cell from which it is synthesized) signals.
Reason: Prostaglandins, found in almost every tissue in humans, are derived enzymatically from the fatty acid arachidonic acid.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.