Chromaffin tissues are part of the:

Correct option is B

Correct Answer: (b) Adrenal gland
Explanation:
→ Chromaffin tissues in fishes are equivalent to the adrenal medulla in higher vertebrates.
→ They secrete catecholamines (adrenaline and noradrenaline).
→ These hormones mediate rapid stress responses.
Information Booster:
→ Located near the cardinal veins in teleosts.
→ Activate cardiovascular changes under stress.
→ Work together with cortisol for complete stress physiology.
Additional Information (Other Options):
(a) Pituitary: Produces tropic hormones.
(c) Thyroid: Produces T3/T4.
(d) Urophysis: Part of caudal neurosecretory system.