In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").

[EX Q]: Fact1: Plants live just about everywhere on Earth., Fact2: Epiphytes are plants that live on other plants., Question: Where do epiphytes live? (A) swamp vegetation (B) mountains (C) vegetation (D) the environment (E) peachleaf willow (F) ice (G) rocks (H) everywhere on earth
[EX A]: H

[EX Q]: Fact1: planting trees has a positive impact on an ecosystem, Fact2: An ecosystem contains many habitats., Question: doing what with trees has a positive impact on habitats (A) making tables (B) chopping down (C) planting (D) watershed (E) earth (F) bloom time (G) growth (H) timbering
[EX A]: C

[EX Q]: Fact1: Prokaryotes are single-celled organisms that lack a nucleus., Fact2: Prokaryotes All bacteria are prokaryotes., Question: what are single-celled organisms that lack a nucleus? (A) Leeuwenhoek (B) orchids (C) Most plants (D) barnacles (E) PDAs (F) bacteria (G) cacti (H) ferns
[EX A]:
F