This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
[{'content': 'Muscle which helps in whistling? \nSelect and explain. \nA. Zygomaticus major, B. Buccinator, C. Procerus, D. Platysma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Facial expressionMuscleSmiling and laughingZygomaticus majorSadnessLevator labii superioris and levatoranguli orisGriefDepressor anguli orisAngerDilator naris and depressor septiFrowningCorrugator supercilii and procerusHorror, terror, and frightPlatysmaSurpriseFrontalisDoubtMentalisGrinningRisoriusContemptZygomaticus minorClosing the mouth Orbicualris orisWhistlingBuccinator and Orbicularis orisRef: Chaurasia; Volume 3; 6th edition; Page no: 57', 'role': 'assistant'}]