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: Skin
Reliable test for chancroid detection- 
Select and explain. 
A. Skin test, B. Biopsy, C. Grams stained smear, D. Clinical examination
C: Grams stained smear
Answer: C: Grams stained smear 
Explanation: C i.e. Grams stained smear