Following an inferior alveolar block injection of 2% lidocaine with 1:100,000 epinephrine, a patient experiences a transient tachycardia. Which is the most likely cause of this reaction?
    
      
        
          
          Intravascular injection.
        
      
      
      
    
      
        
          
          An anaphylactoid reaction.
      
      
      
    
      
        
          
          Myocardial infarction.
      
      
      
    
      
        
          
          An allergic reaction.
      
      
      
    
      
        
          
          Vasovagal syncope.
      
      
      
    
    
    
    
    
    
    
    
  
  
 
              
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