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 Input:
Fact1: Bivalves feed on plankton and nonliving organic matter., Fact2: Mussels are bivalve mollusks., Question: What feeds on plankton and nonliving organic matter? (A) barnacles (B) mollusks (C) animals (D) the Sun (E) sharks (F) graptolites (G) bacteria (H) dogs

Ex Output:
B

Ex Input:
Fact1: Flagella help prokaryotes move., Fact2: Most prokaryotes are unicellular., Question: What helps unicellular organisms move? (A) evaporation (B) bacteria (C) heat energy (D) glucose (E) sweating (F) flagella (G) legs (H) blood

Ex Output:
F

Ex Input:
Fact1: Secondary growth forms secondary vascular tissues and bark., Fact2: Vascular tissue refers to blood vessels., Question: Secondary growth forms secondary (A) blood vessels (B) permineralization (C) Conifers (D) color of leaves (E) oxidation reaction (F) Most plants (G) peachleaf willow (H) shrub beds

Ex Output:
A