You will be given a definition of a task first, then some input of the task.
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: hydropower requires damming a river, Fact2: Rivers are dammed to create reservoirs and hydroelectric power., Question: What feature of the landscape will result from hydropower? (A) mountain (B) river (C) ocean (D) Conifers (E) salinity (F) erosion (G) homogenous (H) resevoir
Output:
H