In case of a heart attack, a hormone is injected as an emergency measure, Which one is it? A. Thyroxine B. Adrenaline C. Heparin D. Insulin

The correct answer is B. Adrenaline.

Adrenaline is a hormone that is released in response to stress. It helps to increase heart rate, blood pressure, and blood sugar levels. This can help to improve the flow of blood to the heart and brain, which can be helpful in the event of a heart attack.

Thyroxine is a hormone that is produced by the thyroid gland. It helps to regulate metabolism. Heparin is an anticoagulant that helps to prevent blood clots. Insulin is a hormone that helps to regulate blood sugar levels.

In the event of a heart attack, it is important to seek medical attention immediately. Administering adrenaline as an emergency measure can help to improve the chances of survival.