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
In which parasitic infestation sputum examination is not of much value - 
Select and explain. 
A. Trichuris trichura, B. Strongyloides, C. Ancyclostoma duodenale, D. Paragonimus Westermanii
A: Trichuris trichura
Answer: A: Trichuris trichura 
Explanation: Diagnosis of trichuris trichura The characteristic eggs are found in stools. The degree of infection can be assessedby egg counts in all other cases sputum examination is beneficial