In a "keep - fit" gymnasium class there are fifteen females enrolled in a weight - loss programme. They all have been grouped in any one of the five weight- groups - W1, W2, W3, W4 or W5. One instructor is assigned to one weight- group only. Sonali, Shalini, Shubhra and Shahira belong to the same weight- group. Sonali and Rupa are in one weight - group. Rupali and Renuka are also in one weight- group. Rupa, radha Renuka, Ruchika and Ritu belong to different weight- group. Somya cannot be with Ritu, and Tara cannot be with Radha. Komal cannot be with Radha, Somya or Ritu. Shahira is in W1 and Somya is in W4 with ruchika. Sweta and Jyotika cannot be with Rupali, but are in a weight - group with total membership of four. No weight - group can have more than five or less than one member. Amita, Babita, Chandrika, Deepika and Elina are instructors of weight - group with membership sizes 5, 4, 3, 2 and 1, respectively. Who is the instructor of Radha?
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