Which one among the following is not correct about Down’s syndrome? डाउन सिन्ड्रोम के विषय में निम्नलिखित में से कौन-सा एक‚ सही नहीं है?

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Which one among the following is not correct about Down’s syndrome? डाउन सिन्ड्रोम के विषय में निम्नलिखित में से कौन-सा एक‚ सही नहीं है?