This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
Which one of the following statements is true to Stockes-Adam attack - 
Select and explain. 
A. It is usually preceded by an aura, B. Focal neurological signs are commonly observed during the attack, C. It is usually caused by high degree of atrioventricular block, D. It is caused by recurrent paroxysmal tachyarrhydunias
C: It is usually caused by high degree of atrioventricular block
Answer: C: It is usually caused by high degree of atrioventricular block 
Explanation: None