Question: What is the most common predator of the animal that is susceptible to the parasite Parelaphostrongylus tenuis and typically inhabit boreal forests and temperate broadleaf and mixed forests of the Northern Hemisphere in temperate to subarctic climates?

Context paragraphs:
Northern Mountain Range, Albania: The Northern Mountain Range (Albanian: "Krahina Malore Verore" ) is a geographical region in northern Albania.  It is one of the four main regions of Albania, the others being Central Mountain Range, Southern Mountain Range, and Western Lowlands.  The northern range encompasses the Albanian Alps extending from the Lake Shkodër shared with Montenegro in the northwest through the Valbonë Valley to the Drin Valley in the east.  The area falls within the Dinaric Mountains mixed forests and Balkan mixed forests terrestrial ecoregions of the Palearctic Temperate broadleaf and mixed forests.

Po Basin mixed forests: Po Basin mixed forests is an ecoregion and biome composed of trees and other vegetation characteristically found in the temperate broadleaf and mixed forests surrounding the Po River in Northern Italy and Southern Ticino in Switzerland, and its watershed from the Cisalpine, or Italian side, of the Alps.

Balkan mixed forests: The Balkan mixed forests constitute a terrestrial ecoregion of Europe according to both the WWF and Digital Map of European Ecological Regions by the European Environment Agency.  It belongs in the Temperate broadleaf and mixed forests Biome and the Palearctic ecozone.

Moose: The moose (North America) or elk (Eurasia), "Alces alces", is the largest extant species in the deer family.  Moose are distinguished by the broad, flat (or "palmate") antlers of the males; other members of the family have antlers with a dendritic ("twig-like") configuration.  Moose typically inhabit boreal forests and temperate broadleaf and mixed forests of the Northern Hemisphere in temperate to subarctic climates. Hunting and other human activities have caused a reduction in the size of the moose's range over time.  Moose have been reintroduced to some of their former habitats.  Currently, most moose are found in Canada, Alaska, New England, Fennoscandia, Baltic States, and Russia.  Their diet consists of both terrestrial and aquatic vegetation.  The most common moose predators are the gray wolf along with bears and humans. Unlike most other deer species, moose are solitary animals and do not form herds.  Although generally slow-moving and sedentary, moose can become aggressive and move quickly if angered or startled.  Their mating season in the autumn features energetic fights between males competing for a female.

Forests of Azerbaijan: The total forest area of Azerbaijan is 1,021,880 ha or 11.8% of the country's area.  The forest biomes consist of temperate deciduous forests, temperate broadleaf and mixed forests, temperate coniferous forests and riparian forests. Specialists estimate that in the 8th-9th centuries the forest cover was around 30-35%, most of it situated in mountainous areas.

Caspian Hyrcanian mixed forests: The Caspian Hyrcanian Mixed Forests ecoregion, in the temperate broadleaf and mixed forests biome, is an area of lush lowland and montane forests covering about 55000 km2 near the southern shores of the Caspian Sea of Iran and Azerbaijan.  The forest is named after the ancient region of Hyrcania (""wolf land"").

Temperate forest: Temperate forests correspond to forest concentration formed in the northern and southern hemisphere, or in temperate regions.  It is the same as a tropical forest except for the climate and some of the animals adaptations.  Main characteristics include: wide leaves, large and tall trees, large wild canopy and non seasonal vegetation.  Temperate forests can be further distinguished by weather patterns and geographical features that favor the predominance of certain kinds of trees.  In temperate coniferous forests, evergreen conifers predominate, while in temperate broadleaf and mixed forests, a more even distribution exists between evergreen trees and deciduous trees.  Temperate deciduous forests, a subgroup of temperate broadleaf forests, consist of trees that lose their leaves every year.  Finally, temperate rainforests typically have heavy rainfall and dense humidity.  But in some temperate forests there are just trees with needles and do not shed their leaves during the winter, so the climate is a little different and not as cold.  They are also known as montane forests.

Daba Mountains evergreen forests: The Daba Mountains evergreen forests are a Global 200 endangered ecoregion located on the Daba Mountains in China.  The forests are part of temperate broadleaf and mixed forests containing both coniferous and broadleaf trees covering a swath of Central China.  Forests here provide a transitional area between evergreen forests to the south and deciduous forests to the north.  The Daba Mountains evergreen forests cover areas of northeast Sichuan Province, southern Shaanxi Province, the northern half of Chongqing Municipality, and western Hubei Province.

Parelaphostrongylus tenuis: Parelaphostrongylus tenuis (also known as meningeal worm, brainworm, or moose illness) is a neurotropic nematode parasite common to white-tailed deer, "Odocoileus virginianus", which causes damage to the central nervous system.  Moose ("Alces alces"), elk ("Cervus canadensis"), caribou ("Rangifer tarandus"), and mule deer ("Odocoileus hemionus") are also susceptible to the parasite but are aberrant hosts and are infected in neurological instead of meningeal tissue.  The frequency of infection in these species increases dramatically when their ranges overlap high densities of white-tailed deer.

Temperate coniferous forest: Temperate coniferous forest is a terrestrial biome found in temperate regions of the world with warm summers and cool winters and adequate rainfall to sustain a forest.  In most temperate coniferous forests, evergreen conifers predominate, while some are a mix of conifers and broadleaf evergreen trees and/or broadleaf deciduous trees. Temperate evergreen forests are common in the coastal areas of regions that have mild winters and heavy rainfall, or inland in drier climates or mountain areas.  Temperate coniferous forests are only found in the Northern Hemisphere in North America, Europe, and Asia.  A separate ecoregion, the tropical coniferous forests, occurs in more tropical climates.

Supporting paragraphs: Parelaphostrongylus tenuis Moose
Answer: the gray wolf