SELECT p.name, SUM(tsl.quantity) as total_quantity 
FROM products p 
JOIN transaction_sell_lines tsl ON p.id = tsl.product_id 
JOIN transactions t ON tsl.transaction_id = t.id 
WHERE t.type = "sell" 
AND t.transaction_date >= DATE_SUB(CURRENT_DATE, INTERVAL 2 MONTH) 
GROUP BY p.id, p.name 
ORDER BY total_quantity DESC 
LIMIT 1;