This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Joints, Subject name: Anatomy
[{'content': 'Manubriosternal joint is - \nSelect and explain. \nA. Primary cartilaginous, B. Secondary caritilaginous, C. Synovial, D. Ellipsoid', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Secondary cartilaginous o Costochondral (stemochondral) joints are primary cartilaginous joints.Cartilaginous joints1) Primary cartilaginous joints (synchondrosis, or hyaline cartilage joint) : These are :-Joint between epiphysis and diaphysis of a growing long bone, i.e. physis.Spheno-occipital joint1st costostemal joint (1st chondrosternal joint)Costochondral joints2) Secondary cartilaginous joints (Symphyses or fibrocartilaginous joints) : These are :-i) Symphysis pubis(iii) manubriostemal joint(v) Symphysis mentiii) Sacroccygeal joint(iv) intervertebral disc", 'role': 'assistant'}]