The patient is suffering from Bell's Palsy.
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Cannot move the muscles on the right side of face
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Facial (VII) nerve
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Loss of taste
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Facial (VII) nerve, Glossopharyngeal (IX), Vagus (X)
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Dry mouth
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Facial (VII) nerve and Glossopharyngeal (IX)
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Cannot close right eye
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Oculomotor (III) and Facial (VII) nerve
Reference
Tortora, G. J., & Derrickson, B. (2017). Principles of anatomy & physiology. Fifteenth edition; Wiley Loose-Leaf Print Companion. Hoboken, New Jersey, John Wiley & Sons, Inc.