This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper limb, Subject name: Anatomy
[{'content': 'Which muscle is inseed into the floor of the inteubercular sulcus of the humerus \nSelect and explain. \nA. Latissimus dorsi, B. Teres major, C. Pectoralis major, D. Deltoid', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Pectoralis major is inseed into the lateral lip of inteubercular sulcus. The inseion is bilaminar. Teres major is inseed into the medial lip of inteubercular sulcus. The deltoid is inseed into the deltoid tuberosity. Latissimus dorsi is inseed into the floor of the inteubercular sulcus. REF: BD Chaurasia 7th edition Page no: 16 Figure 2.15,2.16 , page no:14- BD Chaurasia- upper limb & thorax 6th edition', 'role': 'assistant'}]