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
RBC's are enlarged in infection with -a) P. vivaxb) P. malariaec) P. ovaled) P. falciparum 
Select and explain. 
A. a, B. ac, C. ad, D. b
B: ac
Answer: B: ac 
Explanation: RBC size: Enlarged in –P. vivax and P. ovlae, others- normal size
RBC shape: Oval in P. ovale, others- round