This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oral Cavity & Tongue, Subject name: Anatomy
All are true about Chorda tympani nerve except: 
Select and explain. 
A. Supplies anterior 2/3rd tongue, B. Sensory supply of face, C. It is a branch of facial nerve, D. It joins with lingual nerve
B: Sensory supply of face
Answer: B: Sensory supply of face 
Explanation: Ref: Grays Anatomy 40th edition pg: 543Explanation:Chorda tympani nerveIt is a branch of facial nerve arises within the facial canal 6mnrt above stylomastoid foramenIt enters the infratemporal fossa region by passing through the medial end of the petrotympanic fissure behind the capsule of the temporomandibular joint.The nerve descends medial to the spine of the sphenoid bone (lateral to spine of sphenoid auriculo temporal nerve will pass).It enter the mouth between the medial pterygoid muscle and ramus of the mandibleIt is crossed medially by the middle meningeal artery, the roots of the auriculotemporal nerve and by the inferior alveolar nerve .The chorda tympani joins the posterior aspect of the lingual nerve at an acute angleIt carries taste fibres for the anterior two-thirds of the tongue and efferent preganglionic parasympathetic (secreto-motor) fibres destined for the submandibular ganglion in the floor of the mouth.lt carries secretomotor fibers for both submandibular gland and sublingual gland .(See the following figure)