Given the task definition and input, reply with output. 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").

Fact1: a seismograph is used for measuring the size of an earthquake, Fact2: Most earthquakes are minor tremors., Question: What can measure the size of tremors? (A) hormones (B) measuring tape (C) rulers (D) Plate tectonics (E) graduated cylinders (F) lamphreys (G) seismographs (H) melanin amount
G