493.In a study in UK ,an association was found between sale of antiarryhthmic drug and an increase in death due to asthma .This is an example of

a.Ecological study
b.Cohort study
c.Case reference study
d.Experimental study
Ans-a.Ecological study

492.Hyponatremia with increased sodium body content is seen in

a.Diuretic administration
b.Tubular acidosis
c.Vomiting
d.Nephrotic syndrome


Ans-d.Nephrotic syndrome
Explanation-Hyponatremia with normal body sodium is almost exclusively associated with SIADH.Hyponatremia associated with increased total body sodium results from water retention in excess of sodium retention.The four clinical states where in this phenomenon is seen are congestive heart failure,cirrhosis,nephrotic syndrome and advanced renal failure.

491.Most common site for CSF Rhinorrhea

a.Ethmoidal sinus
b.Frontal sinus
c.Petrous bone
d.Cribriform plate

Ans-d.Cribriform plate

The Cribriform plate and air cells of the ethmoid sinus account for the maximum no of leaks