This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Non communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'Commonest cause of stroke in our country - \nSelect and explain. \nA. Thrombosis, B. Embolism, C. Haemorrhage, D. Infraction', 'role': 'user'}, {'content': 'Answer: A \nExplanation: <p> Cerebral thrombosis is the commonest cause of stroke in India. Reference:Park&;s textbook of preventive and social medicine,K.Park,23rd edition,page no:377-78. <\\p>', 'role': 'assistant'}]