This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parasitology, Subject name: Microbiology
How many pairs of flagella does Giardia lamblia possess - 
Select and explain. 
A. One, B. Two, C. Three, D. Four
D: Four
Answer: D: Four 
Explanation: Ans. is 'd' i.e., Four Giardia (review)o Giardia is a flagellate protozoao It is the only common protozoa that inhabits the duodenum and jejunum (upper small intestine) of human.o Infective form - cysto Mode of transmission - Ingestion of cysto Giardia exists in two forms