This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System Pa 2, Subject name: Physiology
[{'content': 'A healthy 30-year-old male runs on the treadmill for 30 mins.Which of the following muscle does this person use during expiration? \nSelect and explain. \nA. Sternocleidomastoid and Diaphragm, B. Diaphragm and Internal intercostals, C. Internal intercostals and abdominal recti, D. Sternocleidomastoid', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Internal intercostals and abdominal recti are involved in strenuous exercise Muscles involved in Respiration Primary inspiratory Muscles Diaphragm External intercostal muscles Accessory Inspiratory Muscles Sternocleidomastoid Scaleni Alae nasi Small muscles of the head & neck Expiratory Muscles Internal intercostal muscles Rectus Abdominis Internal & external obliques Transversus abdominis', 'role': 'assistant'}]