input: What is the answer to this question? solvent extraction method of refining is adopted for which group of baseoil?

output: conventional petroleum base oils


input: What is the answer to this question? what is the amusement park in national lampoon's vacation?

output: Walley World


input: What is the answer to this question? the venue and year of earth summit on conservation of biodiversity was?

output:
3 to 14 June 1992