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: Social & Preventive Medicine
[{'content': 'Shortest incubation perkm in malaria - \nSelect and explain. \nA. P. vivax, B. P. falciparum, C. P. malariae, D. P. ovale', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]