The upper lip of bovine is short, thick and inflexible. The middle part of the upper lip and the region between nostrils are glabrous and moist, where is called ( ). A: Nasolabial gland B: Nasolabial speculum C: Rima oris D: Angulus oris

The patient's mouth is wet white, cleft lip, nasolabial fold and eyelid seborrheic dermatitis, scrotum redness, exudate, and fear of light tears, tongue pain. Most likely to be lacking(<br/>) A: Vitamin B1 B: Vitamin B2 C: Vitamin A D: niacin