Question: On which stock exchange does the makers of Panadol night have a primary listing?

full_context: Document 1: Delsym: Delsym is a brand of cough medicine owned by Reckitt Benckiser, and manufactured at Unither Manufacturing in Rochester, NY. It is different from most brands of cough medicine in that the active ingredient is "time released". The time release feature allows the drug to suppress the cough reflex for a longer period of time. The active ingredient per teaspoon (5 mL) is dextromethorphan polistirex, equivalent to dextromethorphan HBr 30 mg.
Document 2: Tylenol (brand): Tylenol is a brand of drugs advertised for reducing pain, reducing fever, and relieving the symptoms of allergies, cold, cough headache, and influenza. The active ingredient of its original flagship product is acetaminophen (known in most Commonwealth nations as "paracetamol"), an analgesic and antipyretic. Like the words "acetaminophen" and "paracetamol", the brand name "Tylenol" is derived from the chemical name for the compound, "N"-aceTYL-"para"-aminophENOL (APAP). The brand name is owned by McNeil Consumer Healthcare, a subsidiary of Johnson & Johnson.
Document 3: Toronto Stock Exchange: Toronto Stock Exchange (often abbreviated as TSX) is one of the world's largest stock exchanges. It is the ninth largest exchange in the world by market capitalization. Based in Toronto, it is owned by and operated as a subsidiary of the TMX Group for the trading of senior equities. A broad range of businesses from Canada and abroad are represented on the exchange. In addition to conventional securities, the exchange lists various exchange-traded funds, split share corporations, income trusts and investment funds. More mining and oil and gas companies are listed on Toronto Stock Exchange than any other stock exchange.
Document 4: Chattem: Chattem is an American, Chattanooga, Tennessee-based, producer and marketer of over-the-counter healthcare products, toiletries, dietary supplements, topical analgesics, and medicated skin care products. Originally named the Chattanooga Medicine Company, the company’s brand portfolio holds twenty-two brands including Allegra, Gold Bond, Flexall, IcyHot, Rolaids, Sun-In, Pamprin, Dexatrim, Aspercreme, and Selsun Blue. Two-thirds of Chattem’s products are produced by the company at its Chattanooga production facilities with the remaining produced by third-party producers. The company is a subsidiary of the French multinational pharmaceutical company Sanofi.
Document 5: London Stock Exchange: The London Stock Exchange (LSE) is a stock exchange located in the City of London, England. s of 2014 , the Exchange had a market capitalisation of US$6.06 trillion (short scale), making it the third-largest stock exchange in the world by this measurement (the largest in Europe, ahead of Euronext). The Exchange was founded in 1801 and its current premises are situated in Paternoster Square close to St Paul's Cathedral in the City of London. The Exchange is part of the London Stock Exchange Group.
Document 6: Panadol night: Panadol night is a GlaxoSmithKline painkiller intended for use at night. It consists of 500 milligrams of paracetamol, 25 milligrams of diphenhydramine hydrochloride (a sedating antihistamine) and other "non-hazardous ingredients" It is sold in Australia, Cyprus United Kingdom, Ireland, New Zealand and the Middle East. It became available as an over the counter medication in the UK in 1996.
Document 7: Shire (pharmaceutical company): Shire Plc is a Jersey-registered, Irish-headquartered global specialty biopharmaceutical company. Originating in the United Kingdom with an operational base in the United States, its brands and products include Vyvanse, Lialda, and Adderall XR. Shire has its primary listing on the London Stock Exchange and is a constituent of the FTSE 100 Index. Shire has a secondary listing on NASDAQ.
Document 8: GlaxoSmithKline: The company has a primary listing on the London Stock Exchange and is a constituent of the FTSE 100 Index. As of August 2016 it had a market capitalisation of £81 billion (around $107 billion), the fourth largest on the London Stock Exchange. It has a secondary listing on the New York Stock Exchange.
Document 9: Promethazine: Promethazine is a neuroleptic medication and first-generation antihistamine of the phenothiazine family. The drug has strong sedative and weak antipsychotic effects. It also reduces motion sickness and has antiemetic (via its action on the dopamine receptor D) and anticholinergic properties. In some countries it is prescribed for insomnia when benzodiazepines are contraindicated. It is available in many countries under many brand names. Promethazine was developed in the mid 1940s when a team of scientists from Rhône-Poulenc laboratories were able to synthesize it from phenothiazine and a diamine side chain of diphenhydramine.
Document 10: Hong Kong Stock Exchange: The Stock Exchange of Hong Kong Limited (SEHK) is a stock exchange located in Hong Kong. It is East Asia's and Asia's third largest stock exchange in terms of market capitalization behind the Tokyo Stock Exchange and Shanghai Stock Exchange, and the sixth largest in the world before Euronext. As of 31 October 2016, SEHK had 1,955 listed companies, 989 of which are from mainland China, 856 from Hong Kong and 110 from abroad (e.g. Taiwan, Malaysia, United States, Singapore, etc.) Hong Kong Exchanges and Clearing owns SEHK and is itself listed on SEHK.
Document 11: Pearson PLC: Pearson PLC is a British multinational publishing and education company headquartered in London. It was founded as a construction business in the 1840s. It shut down its construction activities in the 1920s and switched to publishing. It is the largest education company and the largest book publisher in the world. Pearson has a primary listing on the London Stock Exchange and is a constituent of the FTSE 100 Index. It has a secondary listing on the New York Stock Exchange in the form of American Depository Receipts.
Document 12: Donnatal: Donnatal is a proprietary combination medication for the treatment of intestinal cramping due to various causes, often administered as part of a GI cocktail. It is classed as an anticholinergic antispasmodic drug. Donnatal is marketed by PBM Pharmaceuticals. It is available as tablets, capsules, extended release tablets and elixir. Active ingredients are listed as: phenobarbital, atropine and scopolamine. The latter two ingredients are found in plants of the Solanaceae family.
Document 13: GlaxoSmithKline Pharmaceuticals Ltd: GlaxoSmithKline Pharmaceuticals Ltd ( ) is an Indian subsidiary of GlaxoSmithKline plc, one of the world's leading research based pharmaceutical and healthcare companies. It is one of the oldest pharmaceuticals companies in India. It product portfolio includes prescription medicines and vaccines. Its prescription medicines range across therapeutic areas such as anti-infectives, dermatology, gynaecology, diabetes, oncology, cardiovascular disease and respiratory diseases. It also offers a range of vaccines, for the prevention of hepatitis A, hepatitis B, invasive disease caused by H, influenzae, chickenpox, diphtheria, pertussis, tetanus, rotavirus, cervical cancer and others.
Document 14: FTSE 350 Index: The FTSE 350 Index index is a market capitalization weighted stock market index incorporating the largest 350 companies by capitalization which have their primary listing on the London Stock Exchange. It is a combination of the FTSE 100 Index of the largest 100 companies and the FTSE 250 Index of the next largest 250. The index is maintained by FTSE Russell, a subsidiary of the London Stock Exchange Group. See the articles about those indices for lists of the constituents of the FTSE 350.
Document 15: Alka-Seltzer: Alka-Seltzer is an effervescent antacid and pain reliever first marketed by the Dr. Miles Medicine Company of Elkhart, Indiana, United States. It was developed by head chemist Maurice Treneer. Alka-Seltzer is marketed for relief of minor aches, pains, inflammation, fever, headache, heartburn, stomachache, indigestion, acid reflux and hangovers, while neutralizing excess stomach acid. It was launched in 1931. A spin-off of Alka-Seltzer made to relieve colds and flu, Alka-Seltzer Plus, was later introduced. A short-lived antacid non-aspirin variant, Alka-Mints, was introduced in 1994 and discontinued in 1997. Another non-aspirin-based variant, Alka-Seltzer Gold, was later released.
ground_truth: the London Stock Exchange