This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
Investigation of choice of diphtheria carrier is - 
Select and explain. 
A. Throat Swab Culture, B. Gram's stain, C. Albe's stain, D. Zeil Nelson's stain
A: Throat Swab Culture
Answer: A: Throat Swab Culture 
Explanation: Ans. is 'a' i.e., Throat Swab Culture Carriers can be detected only by cultural methods --> Swabs are taken from nose and throat and it is examined by cultural methods for Diphtheria bacilli