Given a text passage, come up with an appropriate title for it. The title should accurately represent what the main focus of the passage is. The title of a passage may be present in the first few sentences of the passage and/or be referred to multiple times in the passage. The title should be 1-5 words long.

Input: Consider Input: Smilodon is an extinct genus of machairodont felid . It is one of the most famous prehistoric mammals , and the best known saber - toothed cat . Although commonly known as the saber - toothed tiger , it was not closely related to the tiger or other modern cats . Smilodon lived in the Americas during the Pleistocene epoch ( 2.5 mya -- 10,000 years ago ) . The genus was named in 1842 , based on fossils from Brazil . Three species are recognized today : S. gracilis , S. fatalis , and S. populator . The two latter species were probably descended from S. gracilis , which itself probably evolved from Megantereon . The largest collection of Smilodon fossils has been obtained from the Rancho La Brea Tar Pits in Los Angeles , California .

Output: Smilodon


Input: Consider Input: The Supremacy Clause of the United States Constitution ( Article VI , Clause 2 ) establishes that the Constitution , federal laws made pursuant to it , and treaties made under its authority , constitute the supreme law of the land . It provides that state courts are bound by the supreme law ; in case of conflict between federal and state law , the federal law must be applied . Even state constitutions are subordinate to federal law . In essence , it is a conflict - of - laws rule specifying that certain national acts take priority over any state acts that conflict with national law . In this respect , the Supremacy Clause follows the lead of Article XIII of the Articles of Confederation , which provided that `` Every State shall abide by the determination of the United States in Congress Assembled , on all questions which by this confederation are submitted to them . '' A constitutional provision announcing the supremacy of federal law , the Supremacy Clause assumes the underlying priority of federal authority , at least when that authority is expressed in the Constitution itself . No matter what the federal government or the states might wish to do , they have to stay within the boundaries of the Constitution . This makes the Supremacy Clause the cornerstone of the whole American political structure .

Output: Supremacy Clause


Input: Consider Input: Mannitol salt agar or MSA is a commonly used selective and differential growth medium in microbiology . It encourages the growth of a group of certain bacteria while inhibiting the growth of others . This medium is important in medical laboratories by distinguishing pathogenic microbes in a short period of time . It contains a high concentration ( about 7.5 % - 10 % ) of salt ( NaCl ) , making it selective for Gram - positive bacteria ( Staphylococcus and Micrococcaceae ) since this level of salt is inhibitory to most other bacteria . It is also a differential medium for mannitol - fermenting staphylococci , containing carbohydrate mannitol and the indicator phenol red , a pH indicator for detecting acid produced by mannitol - fermenting staphylococci . Staphylococcus aureus produces yellow colonies with yellow zones , whereas other coagulase - negative staphylococci produce small pink or red colonies with no colour change to the medium . If an organism can ferment mannitol , an acidic byproduct is formed that causes the phenol red in the agar to turn yellow . It is used for the selective isolation of presumptive pathogenic ( pp ) Staphylococcus species .


Output: Mannitol salt agar