In a teaching session, Acute coronary syndrome is correctly explained as:

A. A clinical spectrum caused by acute myocardial ischaemia, including unstable angina and myocardial infarction. B. A chronic inflammatory airway disorder with variable and usually reversible airflow obstruction. C. Life-threatening organ dysfunction caused by a dysregulated host response to infection. D. A rapid severe systemic hypersensitivity reaction that may compromise airway, breathing or circulation.