Fructose is often regarded as the sweetest sugar among the options provided. It is a natural sugar found in fruits, honey, and some vegetables. Fructose is sweeter than glucose, sucrose (which is a combination of glucose and fructose), and maltose. Due to its high sweetness level, fructose is commonly used as a sweetener in various food products and beverages.

1. Tabaqat-e-Nasiri is a history book which is in Persian language. Which was composed by Minaj-us-Siraj.

2. Minhaj had dedicated this work to the ruler of the Ghulam dynasty, Naseeruddin Mahmood.

The correct answer is Bristlecone pines. Bristlecone pines are the oldest non-clonal species on the planet.