Chest pain caused by inadequate oxygen to the heart.

• A. Allergy
• B. Anaphylaxis
• C. Angina
• D. Asthma

Answer: (C)

Chest pain caused by not enough oxygen reaching the heart muscle is angina. It happens when the coronary arteries are narrowed, so blood flow can't meet the heart’s oxygen needs, especially during activity or stress. That lack of oxygen causes a pressure- or squeezing-like sensation in the chest, which may spread to the arm, jaw, or back, and it’s often relieved by rest or medicine like nitroglycerin.

Other options don’t fit this situation because allergy and anaphylaxis involve immune reactions and effects on the airway or skin, not a shortage of oxygen to the heart muscle. Asthma also involves the airways narrowing and causing chest tightness or wheeze, not ischemic chest pain from the heart itself.