Clinical manifestations of dehydration include all of the following, EXCEPT:

Correct option is D

Dehydration occurs when the body loses more fluid than it takes in, leading to imbalances in electrolytes and body function. Symptoms include headache, dizziness, dry mucous membranes, and concentrated urine. However, dry and brittle nails are generally associated with chronic nutritional deficiencies or other long-term conditions, not acute dehydration. Hence, it is not considered a typical sign of dehydration.
Explanation of options: (a) Headache and light headedness – These are classic symptoms of dehydration due to reduced blood volume and decreased perfusion to the brain, making this a correct manifestation. (b) Dry mouth, eye and lips – These are common signs resulting from reduced fluid availability in mucous membranes and are frequently seen in dehydrated individuals. (c) Small amounts of dark urine – This occurs as the kidneys try to conserve water, leading to reduced urine output and increased concentration, indicating dehydration. (d) Dry and brittle nails – This is the correct answer. Although dry nails may indicate poor nutrition or chronic illness, they are not acute symptoms of dehydration. Therefore, this option does not belong in the list of typical dehydration signs.