This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hemoglobinopathies: Sickle cell anemia, Subject name: Pathology
Person having heterozygous sickle cell trait are protected from infection of: 
Select and explain. 
A. P. falciparum, B. P. vivax, C. Pneumococcous, D. Salmonella
A: P. falciparum
Answer: A: P. falciparum 
Explanation: - People who are heterozygous to sickle cell trait (HbS) are protective against plasmodium falciparum,. - In this condition, parasites grow poorly/die d/tlow oxygen concentrations. Conditions providing protection against malaria G6PD deficiency Thalassemia Sickle cell disease Absence of DUFFY antigen Pyruvate kinase deficiency HbC