Context: A book is a set of written, printed, illustrated, or blank sheets, made of paper, parchment, or other materials, fastened together to hinge at one side, with text and/or images printed in ink. A single sheet within a book is a leaf, and each side of a leaf is a page. A set of text-filled or illustrated pages produced in electronic format is known as an electronic book, or e-book. , An e-reader, also called an e-book reader or e-book device, is a mobile electronic device that is designed primarily for the purpose of reading digital e-books and periodicals., Parchment is a material made from processed animal skin and usedmainly in the pastfor writing on. 
Parchment is most commonly made of calfskin, sheepskin, or goatskin. It was historically used for writing documents, notes, or the pages of a book. Parchment is limed, scraped and dried under tension. It is not tanned, and is thus different from leather. This makes it more suitable for writing on, but leaves it very reactive to changes in relative humidity and makes it revert to rawhide if overly wet., Ink is a liquid or paste that contains pigments or dyes and is used to color a surface to produce an image, text, or design. Ink is used for drawing or writing with a pen, brush, or quill. Thicker inks, in paste form, are used extensively in letterpress and lithographic printing., An electronic book ( variously : e-book , eBook , e-Book , ebook , digital book or e-edition ) is a book - publication in digital form , consisting of text , images , or both , readable on computers or other electronic devices . Although sometimes defined as `` an electronic version of a printed book '' , many e-books exist without any printed equivalent . Commercially produced and sold e-books are usually intended to be read on dedicated e-readers . However , almost any sophisticated electronic device that features a controllable viewing screen , including computers , tablets and smartphones can also be used to read e-books . E-book reading is increasing in the US ; by 2014 28 % of adults had read an e-book , compared to 23 % in 2013 . This is increasing because 50 % of American adults by 2014 had a dedicated device , either an e-reader or a tablet , compared to 30 % owning such a device by the end of 2013 ., A smartphone is a mobile phone (also known as cell phones or cell mobiles) with an advanced mobile operating system that combines features of a personal computer operating system with other features useful for mobile or handheld use. Smartphones, which are usually pocket-sized, typically combine the features of a mobile phone, such as the abilities to place and receive voice calls and create and receive text messages, with those of other popular digital mobile devices like personal digital assistants (PDAs), such as an event calendar, media player, video games, GPS navigation, digital camera and digital video camera. Smartphones can access the Internet and can run a variety of third-party software components ("apps" from Google Play, Apple App Store, etc). They typically have a color display with a graphical user interface that covers more than 76% of the front surface. The display is almost always a touchscreen and sometimes additionally a touch-enabled keyboard like the Priv/Passport BlackBerrys, which enables the user to use a virtual keyboard to type words and numbers and press onscreen icons to activate "app" features., Paper is a thin material produced by pressing together moist fibres of cellulose pulp derived from wood, rags or grasses, and drying them into flexible sheets.
It is a versatile material with many uses, including writing, printing, packaging, cleaning, and a number of industrial and construction processes., A mobile device (or handheld computer) is a small computing device, typically, small enough to hold and operate in the hand and having an operating system capable of running mobile apps. These may provide a diverse range of functions. Typically, the device will have a display screen with a small numeric or alphanumeric keyboard or a touchscreen providing a virtual keyboard and buttons (icons) on-screen. Many such devices can connect to the Internet and interconnect with other devices such as car entertainment systems or headsets via Wi-Fi, Bluetooth or near field communication (NFC). Integrated cameras, digital media players, mobile phone and GPS capabilities are common. Power is typically provided by a lithium battery. , Subject: e-book, Relation: part_of, Options: (A) animal (B) book (C) computer (D) digital media (E) drawing (F) electronic (G) liquid (H) skin (I) text (J) writing
Output: digital media