<prompt> Pneumothorax is a complication ofAxillary blockBrachial plexus blockEpidural blockHigh Spinal block  <response>: B i.e. Brachial Plexus block Brachial plexus block with interscalene approach provides most intense anesthesia in C5-C7 dermatomes and least intense in C8-T1 ulnar nerve area. 