A 52-year-old patient, who has been suffering from angina pectoris, for 2 weeks has increasingly frequent pain attacks in the area behind his sternum and his need for nitroglycerine has increased. Objectively: the condition is of moderate severity. The skin is pale. Heart sounds are weakened, rhythmic. Heart rate is 84/min. ECG shows no signs of focal myocardial injury. What is the most likely diagnosis?a.First-time angina pectorisb.Progressive angina pectorisc.Variant angina pectorisd.Stable NYHA functional class II angina pectorise.Acute cardiac infarction

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