Passage: Mahathir was born at his parents' home in a poor neigbourhood of Alor Setar, the capital of the state of Kedah, British Malaya, on 10 July 1925. His father, Mohamad, was of mixed Malay and Indian descent; his mother, Wan Tempawan, was Malay. Mahathir's non-Malay ancestry, which he largely kept quiet during his political career, is a feature shared by Malaysia's six prime ministers. But another aspect of Mahathir's birth set him apart from the other five: he was not born into the aristocracy or a prominent religious or political family. Mohamad was a school principal whose low socio-economic status meant his daughters were unable to enrol in secondary school, while Wan Tempawan had only distant relations to members of Kedah's royalty. Both had been married previously; Mahathir was born with six half-siblings and two full-siblings.Mahathir was a hard-working school student. Discipline imposed by his father motivated him to study, and he showed little interest in sports. He won a position in a selective English medium secondary school, having become fluent in English well ahead of his primary school peers. With schools closed during the Japanese occupation of Malaya in World War II, he went into small business, first selling coffee and later pisang goreng (banana fritters) and other snacks. After the war, he graduated from secondary school with high marks and enrolled to study medicine at the King Edward VII College of Medicine in Singapore. In college he met his future wife, Siti Hasmah Mohamad Ali, a fellow medical student. After Mahathir graduated, he worked as a doctor in government service before marrying Siti Hasmah in 1956 and returning to Alor Setar the following year to set up his own practice. He was the town's first Malay doctor, and a successful one. He built a large house, invested in various businesses, and employed a Chinese man to chauffeur him in his Pontiac Catalina (most chauffeurs at the time were Malay). He and Siti Hasmah had their first child, Marina, in 1957, before conceiving three...

Question: Who did he marry in 1956?
Siti Hasmah