<prompt> Which of the following effects of adrenaline would be block the by phentolamine but not by propanonolCardiac stimulationRelaxation of bronchial smooth muscleRelaxation of uterusContraction of radiap smooth muscle in the iris  <response>: Ref-KDT 6e p123 Smooth muscle of iris contain alpha receptor whereas hea,bronchus and uterus possess ba-adrenergic receptor 