Detailed Instructions: 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").
Problem:Fact1: Cells are the microscopic building blocks of organisms., Fact2: Any living being is an organism., Question: What are the cells of living beings called? (A) organs (B) Microscopic organisms (C) sub-units of species (D) microscopic building blocks (E) epidermis and dermis (F) cell walls (G) organisms (H) female sex cells
Solution:
D