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: Pathology
[{'content': 'Person having heterozygous sickle cell trait is protected from infection of \nSelect and explain. \nA. P. falciparum, B. P. vivax, C. neumococcus, D. Salmonella', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a. P. falciparum', 'role': 'assistant'}]