This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
[{'content': 'Thrombosthenin is a/an: \nSelect and explain. \nA. Thrombosis preventing protein, B. Contractile protein, C. Coagulation protein, D. Protein for regulating platelets production', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Contractile proteinThrombosthenin - is a contractile protein found within platelets.Q It helps the platelets to contract during clot formation.Other contractile proteins found within platelets are?(i) Actin(ii) Myosin', 'role': 'assistant'}]