Task: Question Answering
Input (English): Question: A 68-year-old man with a history of diabetes of 20 years of evolution, hypertension and prostatism in treatment, consulted for repeated episodes of syncope. The episodes have occurred while standing, after meals and have been preceded by an oppressive pain in the nape, neck and shoulder girdle. Which of these complementary tests is essential? 
 Options:  <1> Brain and cervical MRI. <2> Angio-MR of the supra-aortic trunks. <3> Nuclear medicine study of cerebral dopamine transporter (SPECT with ioflupane). <4> Measurement of blood pressure in decubitus and standing. <5> 24-hour Holter record of the electrocardiogram.
Output (English): 4