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: Viruses cause many human diseases., Fact2: Some smallpox viruses are maintained in laboratories., Question: What can smallpox cause? (A) contamination (B) harmful substances (C) vaccines (D) photosynthesis (E) extinction (F) cellular respiration (G) Destroy crops (H) human disease

Ex Output:
H

Ex Input:
Fact1: hydropower requires damming a river, Fact2: Another source of energy is hydropower., Question: What is a source of energy? (A) fossil fuels (B) cooking (C) damming a river (D) sleeping (E) napping (F) Electrical energy (G) our nearest star (H) sunlight

Ex Output:
C

Ex Input:
Fact1: Fungi lack chlorophyll, so they cannot make food by photosynthesis as plants can., Fact2: Solar energy is absorbed by chlorophyll., Question: What can use photosynthesis? (A) fungi (B) grass (C) fish (D) vegetation (E) flowers (F) vertebrates (G) plant life (H) plants

Ex Output:
E