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
Child having perianal pruritus with following eggs is due to - 
Select and explain. 
A. E.vermicularis, B. Ascaris, C. Ancylostoma duodenale, D. S stercoral is
A: E.vermicularis
Answer: A: E.vermicularis 
Explanation: Ans. is 'a' i.e., E. vermicularis Clinical features of thread worm Infectionso Most pimvorm infections are asymptomatic.o Perianalpruritis is the cardinal symptom. The itching, is worse at night and disturbes sleep,o Heavy infections can cause abdominal pain and weight loss.