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
Simple life cycle is seen in - 
Select and explain. 
A. Ascaris, B. T. solium, C. Toxoplasma, D. Giardia
A: Ascaris
Answer: A: Ascaris 
Explanation: Human parasite may complete their life cycle in a single host or more than one host.Some parasites require two or three host to complete their life cycle Ascaris lumbricoides- single host- human being (refer pgno:6 baveja 3 rd edition)