Cockroach foregut contains a pair of salivary glands. Each salivary gland is branched, the secretions of all the branches being poured into a common duct. For either pair of salivary glands, there is a thin walled salivary receptacle or reservoir which is like a bladder. It stores the salivary secretions. The receptacles of either side have a common receptaculum duct which opens into the common salivary duct. This common salivary duct opens into the mouth cavity at the labium.
Therefore, the correct answer is option C.
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