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What is time taken for the ear to become fully dilated after ear unit has been placed?

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What is time taken for the ear to become fully dilated after ear unit has been placed?

(a) 5-10 min

(b) 10-15 min

(c) 15-20 min

(d) 20-25 min
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Right option is (a) 5-10 min

Explanation: Maximum vasodilatation is achieved by keeping the ear warm. It takes about 5 or 10 min for the ear to become fully dilated after the ear unit has been put up in place and the lamp turned on.
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