This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Surfaces and Grooves, Subject name: Anatomy
[{'content': 'Muscle of expiration \nSelect and explain. \nA. External intercostal, B. Diaphragm, C. Internal intercostal, D. Serratus anterior', 'role': 'user'}, {'content': 'Answer: C \nExplanation: MUSCLE OF INSPIRATION: Quiet: Diaphragm External intercostals Interchondral pa of internal intercostal of contralateral side. Deep: Erector spinae Scalene muscles Pectoral muscles Serratus anterior MUSCLE OF EXPIRATION: Quiet: Passive process d/o inherent quality of lungs Forced: Muscles of anterior abdominal wall with internal intercostal (except interchondral pa)', 'role': 'assistant'}]