question: Who based their research on Enrlich 's stains works ?
answer: Gram stain and the Ziehl -- Neelsen
turker_answer: Gram stain and the Ziehl -- Neelsen based their research on Enrlich 's stains works .
rule-based: Gram stain and the Ziehl -- Neelsen based their research on Enrlich 's stains works .