Which one of the following is not a Biosphere Reserve?

Agasthyamalai (Agasthamalai), Nilgiri and Panchmarhi are explicitly listed among India’s biosphere reserves in authoritative lists: the comprehensive list of 18 biosphere reserves includes Agasthamalai, Nilgiri and Panchmarhi [1], and Nilgiri and Panchmarhi are also noted among those included in the World Network of Biosphere Reserves [2]. The term “Nallamalai / Nallamala” (option 2) refers to a hill range and associated forests (e.g., Nallamala Hills) but it does not appear in the official enumerations of India’s designated biosphere reserves cited above. Therefore Nallamalai is not a recognised biosphere reserve while the other three are [2].

Sources

1. [1] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 5: Natural Vegetation and National Parks > BIOSPHERE RESERVES > p. 49
2. [2] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 4: BIODIVERSITY > zoning of Biosphere reserves > p. 37