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: Microbiology
A 35-year-old male suffering from sudden onset of high grade fever. On malarial slide examination all stages of parasites are seen with schizonts of 20 microns size with 14-20 merozoites per cell and yellow brown pigment. The diagnosis is: 
Select and explain. 
A. Plasmodium falciparum, B. Plasmodium vivax, C. Plasmodium malariae, D. Plasmodium ovale
B: Plasmodium vivax
Answer: B: Plasmodium vivax 
Explanation: Ans. (b) Plasmodium vivax Catch clue of answer from question. In this question clue is 'colour of pigment' which are: Black pigment : P falciparum Brown black : P malariae Dark brown : P ovate Yellow brown : P vivax