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
Investigation of choice for amoebiasis is? 
Select and explain. 
A. ELISA, B. Colonoscopy, C. Microscopy, D. Microscopy + ELISA
D: Microscopy + ELISA
Answer: D: Microscopy + ELISA 
Explanation: Ans. (d) Microscopy + ELISARef: Harrison's 18thed ch-109