There has been a terrible accident and several people have been injured. you are working in the hospital, taking care of the blood supply. you are low on blood, so you need some volunteers to give their blood. you check on your list of people who have given blood in the past. you find the following information: jennifer has type a blood, rh- amy has type b blood, rh+ emely has type ab blood, rh+ sammy has type o blood, rh - the injured people are rushed into the emergency room. the doctors quickly test their blood to find out what type they will need. they rush the results to you: valentina has type o, rh+ isabella has type ab, rh - who can give blood to isabella? A. Amy & Sammy
B. Emely & Sammy
C. Jennifer & Sammy

A46-year-old man with a history of hypertension and hypercholesterolemia visits the physician for a routine followup. the patient's job involves a lot of travelling, and he admits to occasionally forgetting to take his medications with him when he travels. he complains of several episodes of chest pain in the past few months. the pain is sharp in nature, mainly over his lower chest and epigastrium, and tends to come on when walking. he believes these episodes are due to indigestion and has been taking antacids. there is a family history of heart disease, and his father died of a heart attack at age 48. on physical examination, his blood pressure is 150/80 mmhg and heart rate is 86/min. his lungs are clear to auscultation. cardiac auscultation reveals normal rate and rhythm, without rubs, gallops, or murmurs. there is no pedal oedema. he is sent for an exercise stress test. five minutes into the test, he develops st depression of 3mm in leads v1-v5. the st segment depression is greater than 0.12 seconds in duration and the stress test is stopped. which of the following is the most appropriate next step in management? - coronary angiography- holter monitor- no further tests are required- repeat stress test with thallium- upper gastrointestinal endoscopy